Corrupt Client File

I've been wanting to create custom sprites in my Fab's source server but whenever I try to open the client file in Sothink Swf Decompiler it says "Cannot open client.swf it is corrupted", all the other pserver clients work just not Fab's

Any Suggestions?

decompress the swf, should be around 8mb in size - it works
use rabcdasm to do so (only to decompress it)