I am working on the problem of searching for updates of a file. I have come up with a set logical points that must be met before a file can be judged to be the update of another file. These points are all carried out through examining the filenames, ie. comparing length of name, file extension, numeric character at end of file name etc.
What I was wondering was, is this a valid way of finding updates, or is there an easier, more efficient way?

Cheers