ScrnXtra - Trying to save to Windows as BMP; getting error -10

Question

Hello Fellow Director hanger-on-ers!
I have a question on awesome cast member to output ScrnXtra v2.2.0.  Am trying to save screen shot of the stage to a file (bmp).  The OS that is not working for me is Windows 7 using Director 11.5.  Tested on Mac OS Mavericks / D11.5 with PICT and works great!  Windows - does not work.  Also attempted to contact Pierre who made the v2.2.0 Xtra but the time difference may not get an answer back today.  (hoping)
Code I'm using:
var_filename = the moviePath & “Postcards\test.bmp”
put var_filename
var_saveresult = ScreenToFile(441,115,1241,715, var_filename)  -- L T R B (800x600)
put var_saveresult
Error code received is -10 “File open failure” and no file is written. 
Postcards directory is indeed there, and I even use Buddy API to verify that it's there and if not to make it.
I put the var_filename to the message window and it shows correctly.
Any ideas?  Even made the directory full user rights for R/W, shared, you name it thinking it may be a permission problem.
You can download the Xtra here: ScrnXtra for Director
Much obliged to any assistance!
Cheers,
Monica

Answer 1

More to add after some additional testing!  I opened up the sample file in Director 11.5 Windows and tested.  It worked to save the BMP - but with a few caveats.
1) Strange filename replacement:
When typing the filename, I used "test".   The filename saves as ".est.bmp".  The T has been replaced by a dot.   This was consistent with anything that I used for the filename.  Letters, numbers, et cetera.
2) Cannot use a path and only saves in the root:
My challenge is that I would like to save the screen shots in a subfolder of the application root.  Any time that I attempt to put a directory "Postcards\" before a file name or path it returns the error -10 File open failure. 
3) So the Xtra on the Mac works great with folder paths.  The Windows not-so-much.   I think I may have to do a multi-step script using BuddyAPI to find the file, rename it the proper filename without the dot and then move it into the Postcards directory.
Not solved and probably a bug in the Xtra.  The Xtra source is found on that ScrnXtra link above if anyone has the cajones to modify the Windows source binaries to solve the bug.   
Keep any other thoughts and comments coming if you have any.
Cheers,
Monica