Can cc suddenly turn corrupt?

I'm not an expert on custom content, and I know nothing about CC Magic. But I do know there's often an issue with .package files on FAT32-formatted drives. I don't know what it is, and the one time I tested thoroughly, NRaas mods were fine. It was only TS4 cc that couldn't be read. (I used a symbolic link to move the user data folder to an external drive.) When TS4 threw the error, it had the same ._ in front of each file name that it flagged as corrupt. On the other hand, the files were fine once they were back on an internal drive, so the files weren't permanently damaged.

I don't know how to you might go about fixing your files, unfortunately. I'm just throwing this out there in case someone else who could otherwise help better doesn't know what to make of the period-underscore in front of the file names. I mean, you could try simply renaming them, I guess, to remove the ._ that shouldn't be there. Other than that though, I have no idea.