Hmm... So the files are opening badly when opened INTO Final Writer. Bummer.
Were these files altered in any way? FTP'd? Put through a UNIX/DOS text conversion? Stored on, or touched by a Macintosh?
The reason I ask is that in the splattering of characters at the top of the file, there seem to be a few characters showing up in front of the "FORM" key. My Final Writer files don't seem to have that. They lead right off with the "FORM" as the first 4 characters.
I wonder if that is what is confusing Final Writer and causing it to try to open them as text files, instead of Final Writer format files.