I have a client I am helping out and I've never seen this one before. When I opened up their backup file they got inside some of the files it shows NUL (not to be confused with NULL)
It looks like if the file was maybe binary or something instead just normal PHP code. Any ideas on how the files can be converted back to normal PHP code? The sizes of the files still show as if there is content inside of them.
If it helps - here's a screenshot:
