http://bugs.winehq.org/show_bug.cgi?id=5610
--- Comment #10 from Austin English austinenglish@gmail.com 2009-03-04 16:27:09 --- (In reply to comment #9)
:~/.wine/drive_c/PsTools$ wine psexec.exe \vpathak2 "notepad.exe"
May not be the problem, but the '' character needs to be escaped (with itself, ironically enough). That's why you see it parsed as:
PsExec could not start \vpathak2:
You could try: $ wine psexec.exe '\vpathak2' "notepad.exe"