Windows 10: So when did one drive deletes files if you delete it in your windows machine?

So I recently backed up ALL OF my files because I was moving to linux, but then I wanted to come back because of my windows app dependency most of my software runs on windows, and emulating isnt always an answer hereI was deleting all of my onedrive bs because I didn't want it, but rather a fresh install. I deleted everything, now I check my OneDrive, and nothing is there anymore after I needed a old DOC for my passwords. Good job, Microsoft.

:)

 

Files Deleted During Failed Windows Update

If you saved your video projects, they should be on the drive (barring any file system corruption). You can give Recuva a try:

Accidentally deleted an important file? Lost something important when your computer crashed? No problem! Recuva recovers files deleted from your Windows computer, Recycle Bin, digital camera card, or MP3 player. And it's free!​
Download the portable version on another PC, unpack it on a flash drive, pop the drive in the trouble machine, and run it off the flash drive. You want to make as few changes to the hard drive as possible before running the recovery program.

 

Can I delete this unknown file safely?

Well then simply erase (Shift + Del) the $RECYCLE.BIN folder of that drive, I just find it odd that Windows doesn't pick up the drive's recycle bin when you connect it.
And yes it's completely safe to delete the whole $RECYCLE.BIN folder, it wont affect any of the other files/folders on the drive, and whenever you delete (Del) another file it will be re-created.

 

How do I delete registry files?

HKEY_Current user will only delete the keys within the current account ur using so if u have another account, the keys will remain on that one. To delete it from ur entire system local machine is what u use. Ur second question i can't answer. sry