🚀 go-pugleaf

I'm having trouble salvaging a MacWrite document from a file which
MacWrite won't open.  It's a 42K document which the user says closed
ok on Friday, but wouldn't open Saturday.  MacWrite starts up, opens
the file, but the watch stays on the screen and we can't see more than
the title.  Naturally, the file represents a month's work and he doesn't
have a backup.

Word also won't open it, MacTools verifies the disk ok, and bit-copies
exhibit the same behavior.  The only funny thing I could see in the
directory was that the Finder Flags are 0101 rather than the usual 0100.
How is the last bit (and for that matter, byte) used?  Any ideas on what
might be the problem, or more importantly, how to salvage the contents?
Thanks!