Ummm... define "from Nasm". There's an "installer" for Windows which has an "uninstaller" which, if you do it wrong, will delete random files. I think we've got that out of there. I hope so! Something deleted with sys_unlink? At one time I used to know how to undelete a FAT file, but I think that's slipped away. I don't know much about the file systems Linux uses. I accidentally deleted my "inbox" last fall, but decided to let it go rather than try to recover it. Surely could have been done...
What are you up against?
Best,
Frank