Arduino

How to uninstall Arduino from your system

This page is about Arduino for Windows. Below you can find details on how to remove it from your PC. It is made by Arduino LLC. More information about Arduino LLC can be found here. Arduino is frequently set up in the C:\Program Files (x86)\Arduino folder, however this location may vary a lot depending on the user's option while installing the program. The full command line for removing Arduino is C:\Program Files (x86)\Arduino\uninstall.exe. Keep in mind that if you will type this command in Start / Run Note you might be prompted for admin rights. arduino.exe is the programs's main file and it takes about 853.00 KB (873472 bytes) on disk.

Arduino installs the following the executables on your PC, occupying about 74.86 MB (78491169 bytes) on disk.

• arduino-builder.exe (3.20 MB)
• arduino.exe (853.00 KB)
• arduino_debug.exe (390.00 KB)
• uninstall.exe (401.68 KB)
• dpinst-amd64.exe (1,023.08 KB)
• dpinst-x86.exe (900.56 KB)
• listComPorts.exe (44.54 KB)
• avr-ar.exe (591.50 KB)
• avr-as.exe (810.50 KB)
• avr-g++.exe (1.64 MB)
• avr-gcc.exe (1.63 MB)
• avr-ld.exe (1.03 MB)
• avr-nm.exe (576.50 KB)
• avr-objcopy.exe (732.00 KB)
• avr-objdump.exe (848.00 KB)
• avr-ranlib.exe (591.50 KB)
• avr-strip.exe (732.00 KB)
• avr-addr2line.exe (566.50 KB)
• avr-c++filt.exe (565.00 KB)
• avr-cpp.exe (1.64 MB)
• avr-elfedit.exe (58.00 KB)
• avr-gcc-ar.exe (54.00 KB)
• avr-gcc-nm.exe (54.00 KB)
• avr-gcc-ranlib.exe (54.00 KB)
• avr-gcov.exe (1.25 MB)
• avr-gdb.exe (4.54 MB)
• avr-gprof.exe (653.50 KB)
• avr-readelf.exe (407.00 KB)
• avr-run.exe (607.50 KB)
• avr-size.exe (576.00 KB)
• avr-strings.exe (567.00 KB)
• avrdude.exe (397.50 KB)
• loaddrv.exe (15.50 KB)
• cc1.exe (8.82 MB)
• cc1plus.exe (9.69 MB)
• collect2.exe (1.29 MB)
• lto-wrapper.exe (1.43 MB)
• lto1.exe (8.28 MB)
• fixincl.exe (141.00 KB)
• jabswitch.exe (30.09 KB)
• java-rmi.exe (15.59 KB)
• java.exe (186.59 KB)
• javacpl.exe (66.59 KB)
• javaw.exe (187.09 KB)
• javaws.exe (272.09 KB)
• jjs.exe (15.59 KB)
• jp2launcher.exe (75.09 KB)
• keytool.exe (15.59 KB)
• kinit.exe (15.59 KB)
• klist.exe (15.59 KB)
• ktab.exe (15.59 KB)
• orbd.exe (16.09 KB)
• pack200.exe (15.59 KB)
• policytool.exe (15.59 KB)
• rmid.exe (15.59 KB)
• rmiregistry.exe (15.59 KB)
• servertool.exe (15.59 KB)
• ssvagent.exe (49.59 KB)
• tnameserv.exe (16.09 KB)
• unpack200.exe (155.59 KB)
• ctags.exe (275.20 KB)

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The information on this page is only about version 1.6.6 of Arduino. Click on the links below for other Arduino versions:

• 1.8.2
• 1.6.10
• 1.8.14
• 1.8.15
• 1.8.8
• 1.6.54
• 1.5.4
• 1.8.5
• 1.8.6
• 1.6.5
• 1.8.19
• 1.8.18
• 1.6.2
• 1.8.10
• 1.8.16
• 1.0.6
• 1.8.3
• 1.6.9
• 1.6.13
• 1.8.7
• 1.6.7
• 1.8.12
• 1.8.9
• 1.6.52
• 1.5.7
• 1.8.13
• 1.8.0
• 1.5.8
• 1.6.11
• 1.6.8
• 1.6.12
• 1.8.4
• 1.6.1
• 1.6.0
• 1.6.55
• 1.6.3
• 1.6.4
• 1.8.1
• 1.0.5
• 1.8.11

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Numerous files, folders and Windows registry data will not be deleted when you are trying to remove Arduino from your computer.

Directories left on disk:

• C:\Users\%user%\AppData\Local\Arduino15
• C:\Users\%user%\AppData\Local\Autodesk\webdeploy\production\9eb6e3e95b2f4cf7bb2f804604f4040b86fc00dd\Applications\Electron\LibEagle\examples\projects\examples\arduino
• C:\Users\%user%\AppData\Local\Autodesk\webdeploy\production\ca426f89300c9832c554fb1598dc1364864ea03e\Applications\Electron\LibEagle\examples\projects\examples\arduino

The files below remain on your disk by Arduino when you uninstall it:

• C:\Users\%user%\AppData\Local\Arduino15\library_index.json
• C:\Users\%user%\AppData\Local\Arduino15\package_index.json
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\boards.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168_atmega1280.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168_atmega328.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168_atmega328_pro_8MHz.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168_diecimila.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168_ng.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\ATmegaBOOT_168_pro_8MHz.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega8\ATmegaBOOT.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega8\ATmegaBOOT.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega8\ATmegaBOOT.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega8\ATmegaBOOT-prod-firmware-2009-11-07.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\atmega8\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\bt\ATmegaBOOT_168.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\bt\ATmegaBOOT_168.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\bt\ATmegaBOOT_168_atmega328_bt.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\bt\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Esplora.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Esplora.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Genuino-Micro.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Genuino-Micro.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Leonardo.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Leonardo.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Micro.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Micro.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Yun.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Caterina-Yun-noblink.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Descriptors.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Descriptors.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Esplora-prod-firmware-2012-12-10.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Esplora-prod-firmware-2012-12-10.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Leonardo-prod-firmware-2012-04-26.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Leonardo-prod-firmware-2012-04-26.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Leonardo-prod-firmware-2012-12-10.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Leonardo-prod-firmware-2012-12-10.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Micro-prod-firmware-2012-11-23.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Micro-prod-firmware-2012-11-23.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Micro-prod-firmware-2012-12-10.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina\Micro-prod-firmware-2012-12-10.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Caterina.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Caterina.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Caterina-Robot.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Caterina-Robot-Control.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Caterina-Robot-Motor.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Descriptors.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Descriptors.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-Arduino_Robot\README.md
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Caterina.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Caterina.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Caterina-LilyPadUSB.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Descriptors.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Descriptors.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\caterina-LilyPadUSB\Readme.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\gemma\avrdude.conf
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\gemma\gemma_v1.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\gemma\README.md
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\gemma\usbconfig.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\gemma\usbconfig.patch
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\lilypad\LilyPadBOOT_168.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\lilypad\src\ATmegaBOOT.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\lilypad\src\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\boot.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\makeall
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\omake
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega168.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega168.lst
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega328.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega328.lst
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega328-Mini.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega8.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\optiboot_atmega8.lst
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\pin_defs.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\README.TXT
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\optiboot\stk500.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\avr_cpunames.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\avrinterruptnames.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\command.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\License.txt
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\Makefile
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\Mega2560-prod-firmware-2011-06-29.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\stk500boot.c
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\stk500boot.ppg
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\stk500boot_v2_mega2560.hex
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\STK500V2.pnproj
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\bootloaders\stk500v2\STK500V2.pnps
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\cores\arduino\abi.cpp
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\cores\arduino\Arduino.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\cores\arduino\binary.h
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\cores\arduino\CDC.cpp
• C:\Users\%user%\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.9\cores\arduino\Client.h

Use regedit.exe to manually remove from the Windows Registry the data below:

• HKEY_CLASSES_ROOT\Applications\arduino.exe
• HKEY_CLASSES_ROOT\Arduino file
• HKEY_CURRENT_USER\Software\DefaultCompany\Control Arduino From Unity
• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage\arduino.cc
• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage\forum.arduino.cc
• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage\playground.arduino.cc
• HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry\DOMStorage\www.arduino.cc
• HKEY_LOCAL_MACHINE\Software\Arduino
• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Arduino
• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Ultimaker Cura 4.8.0\Components\arduino

Registry values that are not removed from your PC:

• HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\bam\State\UserSettings\S-1-5-21-528807025-2548101698-2484727540-1001\\Device\HarddiskVolume4\Users\UserName\Downloads\arduino-1.8.13-windows.exe

A way to delete Arduino from your computer with the help of Advanced Uninstaller PRO

Arduino is a program by the software company Arduino LLC. Frequently, people choose to erase this program. Sometimes this is hard because doing this by hand takes some advanced knowledge regarding Windows program uninstallation. The best EASY approach to erase Arduino is to use Advanced Uninstaller PRO. Here are some detailed instructions about how to do this:





1. If you don't have Advanced Uninstaller PRO on your Windows PC, install it. This is good because Advanced Uninstaller PRO is one of the best uninstaller and all around utility to maximize the performance of your Windows system.

DOWNLOAD NOW

• go to Download Link
• download the program by pressing the green DOWNLOAD button
• install Advanced Uninstaller PRO

2. Run Advanced Uninstaller PRO. It's recommended to take some time to admire the program's design and number of features available. Advanced Uninstaller PRO is a powerful system utility.

3. Press the General Tools button


4. Activate the Uninstall Programs tool


5. All the programs installed on your computer will be made available to you

6. Scroll the list of programs until you locate Arduino or simply activate the Search feature and type in "Arduino". If it is installed on your PC the Arduino app will be found automatically. When you select Arduino in the list of programs, some data regarding the program is available to you:

• Star rating (in the left lower corner). This explains the opinion other users have regarding Arduino, ranging from "Highly recommended" to "Very dangerous".
• Opinions by other users - Press the Read reviews button.
• Details regarding the app you want to uninstall, by pressing the Properties button.

7. Click the Uninstall button. A confirmation dialog will come up. Confirm the removal by pressing Uninstall. Advanced Uninstaller PRO will automatically uninstall Arduino.


8. After uninstalling Arduino, Advanced Uninstaller PRO will offer to run a cleanup. Click Next to go ahead with the cleanup. All the items of Arduino that have been left behind will be detected and you will be asked if you want to delete them. By removing Arduino using Advanced Uninstaller PRO, you can be sure that no registry entries, files or directories are left behind on your disk.

Your computer will remain clean, speedy and ready to run without errors or problems.

Geographical user distribution

Disclaimer

This page is not a piece of advice to remove Arduino by Arduino LLC from your PC, nor are we saying that Arduino by Arduino LLC is not a good application for your PC. This page simply contains detailed info on how to remove Arduino in case you decide this is what you want to do. The information above contains registry and disk entries that other software left behind and Advanced Uninstaller PRO stumbled upon and classified as "leftovers" on other users' computers.