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Ok I'm not sure I am looking at the right table, but there is a table in my database called "sigpic" it has a field in it called "filename" and most every entry in that field is a .jpg (saw a couple of .png).
So what I suspect "may" be happening is that when you check the checkbox to tell it to allow animated signatures that even if someone uploads a .jpg it converts the file and stores it as a .gif in the filesystem on the server. But that must mean that vbulletin code knows to change the extension at display time. Have you looked through the postbit code to see where it is grabbing the sigpic from and if it is doing something to the extension on the fly? I concur the filename variable in the sigpic table is almost always a .jpg but the actual file in the filesystem is a .gif on the server.
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