Cannot find the file named...

[David Artman]

Hi, all;

Latest, out-of-the-blue functional bug on FM8.0p277, Win 7:

1) Navigate to working folder for project [just like every day].
2) Double-click BOOK file.
   FrameMaker opens, them immediately displays the following message:
   "Cannot find the file named __. Make sure that the file exists.
3) Click OK on that message.
4) On the FrameMaker menu, click File > 1 [file_name].
   FrameMaker immediately displays the same error message as in step 2, 
   then FrameMaker displays the Open dialog, at the project folder root 
   (i.e., last folder to which I wrote files).
5) Double-click the BOOK file in the Open dialog.
   The BOOK file opens in FrameMaker.

Same behavior if I try to do the above with a standalone FM file.

I have, over the course of days, installed software that does various
things to interface with the hardware that I am documenting, so it's
possible something went pear-shaped with Windows. I'm *inclined* to
blame FM because (a) Windows knows the BOOK should open Frame, and sends
it to Frame, and only THEN does Frame claim not to find it; and (b) it's
FrameMaker 8. By Adobe. So, yeah....

Any ideas what I could do to repair whatever's gone wrong? I'm comfy
manipulating INI file and the Windows Registry. But I can't reinstall
FM8, though I *have* rolled back and reapplied all patches (p266 is 155
MB, so I imagine it's pretty thoroughly updating everything). This
problem persists through daily reboots.
Thanks in advance;
David