Was sent an "untyped binary data" file with no extension. It's audio. Using a Mac, I've tried adding the .mp3, .aac, .wav extensions, and it won't open. What now? [more inside]
posted by acidic on Sep 29, 2008 - 14 answers

In OSX how do I get files without extensions to be recognized by something other than Excel? Ideally I'd like them to be opened by the shell, or perhaps a new session in iTerm but iTerm is greyed out in the Choose Application menu.
posted by Null Pointer and the Exceptions on Dec 1, 2006 - 5 answers

How can I change/append an extension of a large number of files at once? [more inside]
posted by Ekim Neems on Mar 2, 2006 - 7 answers

How do you find out the extension of a file where it has been removed? I think it's a compressed file but I can't seem to get the slightest clue beyond that.
posted by Zootoon on Mar 16, 2004 - 7 answers