[Bug 20812] New: Respect %windir% in middle of file path

http://bugs.winehq.org/show_bug.cgi?id=20812

Summary: Respect %windir% in middle of file path
           Product: Wine
           Version: 1.1.33
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Installing Performance Guru with Wine generates this desktop file:

#!/usr/bin/env xdg-open
[Desktop Entry]
Name=Performance Guru
Exec=env WINEPREFIX="/home/scott/.wine" wine "C:\program
files\Flygprestanda\%windir%\system32\javaw.exe" -Djava.library.path=.\
-Dguru.path=.\ -jar "c:\program files\Flygprestanda\guru-core.jar"
Type=Application
StartupNotify=true
Path=/home/scott/.wine/dosdevices/c:/Program Files/Flygprestanda
Icon=/home/scott/.local/share/icons/d37a_flygp.png

However, this .desktop file doesn't work for actually opening the application. 
Wine returns:

wine: cannot find 'C:\program files\Flygprestanda%windir%\system32\javaw.exe'

If I manually change this to:
Exec=env WINEPREFIX="/home/scott/.wine" wine "C:\windows\system32\javaw.exe"
-Djava.library.path=.\ -Dguru.path=.\ -jar "c:\program
files\Flygprestanda\guru-core.jar"

The program loads a bit but dies with a java file not found warning when I
double click the .desktop file.  The same thing happens when I run the above in
a terminal window (from folder ~).

If I change my working directory to ~/.wine/drive_c/Program Files/Flygprestanda
on the terminal and then run the exec line above it works normally.

So it seems that there are 2 things: 1) we don't support %windir% properly when
it's in the middle of the file path, and 2) we need to set the working
directory to whatever the path was before the %windir%