"Bin" is just an arbitrary file extention meaning binary data. It's not a specific file format like a Word for Windows ".doc" file, it's not an image file like ".gif", and it's not an ASCII file like ".txt".

The BIN file for the empeg logos is different than the BIN files for your Worms game. For instance, the BIN files for the empeg logos are only viewable in the empeg logo editor, and if someone named an empeg animation file BIN, it would only be viewable in Jemplode, and neither could be opened in Worms. You can't expect to make a worms file out of an empeg logo, nor an empeg logo out of a worms file.