To save space, I packed personal files into .rar archive files with encrypted file names and a password – like this:
I wanted to keep the contents within them obscure by renaming those .rar files and removed the file extension (a BIG MISTAKE) before uploading them to Google Drive. I've since deleted the files on my PC to save space.
I've uploaded a LOT of these .rar files (~50 GB worth). When I downloaded one and re-added the ".rar" to the end of the file, it said "The archive is either in unknown format or damaged" as shown here:
My own limited research told me the metadata/signature/Start Header & End Header of the file has been lost/corrupted and needs to be recovered before the .rar file's contents can be read. I modified the file in a hex editor (the first 6 letters) so that the WinRAR window would at least open, and got these error messages:
So after my dumb self tried countless methods of repairing the .rar file (inbuilt WinRAR repair feature/using 7zip DIDN'T WORK), it'd be a lifesaver if anyone had better experiences with any good .RAR/archive file recovery software that they'd recommend, or methods to repair this.