Today I cleaned up one of my drives and while doing so I got an error message saying Item Not Found.... "Whatever" I thought and happily clicked skip.
After finishing I checked again and saw the folder I deleted before but only containing a single file. I tried to move, delete and rename it but nothing would work. Always the same error message.
"Fuck this" I said to myself and opened up a command prompt. Just to realize it's as nearly as useless as the explorer.
del "\\?\C:\test\file-with-space-after.extension "
Or just use Linux because it doesn't have such problems. You can
mv or whatever every file no matter how many whitespaces it has after the extension.
More information can be found here: docs.microsoft.com