neowin[.]net/news/thisismyfile-284
ThisIsMyFile 2.84
It usually happens [thankfully] rarely, but I think most of us have had an occasion or three where there was a file or folder we just couldn't get rid of. ThisIsMyFile is a small app that can run portably to get rid of those. I don't have any files at the moment to test it on [again thankfully], but at about 1/4 MB it might be worth downloading & hanging onto for the next time you get cursed.
Following the directions in the "readme portable and install.txt", I renamed "ThisIsMyFile.exe" to "ThisIsMyFile_Portable_Install.exe". Running that file created a C:\ThisIsMyFile folder, containing the app, 2 .ini files, & the uninstall app. No other files or new registry entries were recorded, & that folder copied to a USB stick should run wherever without adding anything to the host copy of Windows.