wine users - Aug 2010 - Unable to write a log file

I'm trying to run Brainvision Analyzer software through wine on my mac (OSX
Snow Leopard).  When I enter my registration info for the software, I get an
error message:

File Write Error
:\Users\...\license.txt

where "..." is a path to a folder that contains license.txt, but the
file is unchanged when I run the program.  Any idea why the program can't
write to the file?

The program's documentation suggests that I could circumvent the problem by
writing the license info to license.txt myself.  I tried writing it with a mac
ascii editor to no avail: I'm still prompted to enter my info when the
program starts.  Any ideas?

Hmm.  Shouldn't there be a drive letter before the colon?

You might run the app with
  export WINEDEBUG=+file
  wine ... > log.txt 2>&1

where ... is the path to the app.  The log might show what's
going on.  It'll be really big, so don't paste it all in here.

I found the following entry in my OSX log for the installation:

fixme:file:MoveFileWithProgressW MOVEFILE_WRITE_THROUGH unimplemented

You need to see what format of txt file its supposed to be and make sure you
edit it and save it in the proper format... if your trying to do the manual
entry.