[Bug 26303] New: Rayman 2 Demo menu item doesn't work until you remove a backslash

http://bugs.winehq.org/show_bug.cgi?id=26303

Summary: Rayman 2 Demo menu item doesn't work until you remove
                    a backslash
           Product: Wine
           Version: 1.3.15
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: programs
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

ftp://ftp.ubisoft.com/Rayman2/rayman2high.zip
(sha1sum 14b2ad6f41e2e1358f3a4a5167d67a7111ea4fb5 )
is a cute little game that works well if you do
  winetricks-alpha vd=640x480 dinput
and run it with
  wine c:\UbiSoft\Rayman2Demo\Rayman2Demo.exe
but it fails if you use the freedesktop.org icon placed
on the desktop or in the system menus.  The icon target is

env WINEPREFIX="$HOME/.local/share/wineprefixes/rayman2_demo" wine
C:\windows\UbiSoft\SetupUbi.exe -play\ Rayman2

That command in a terminal reproduces the error. 
Removing the backslash between 'play' and 'Rayman2'
works around the problem, and lets you start the game from the menus.

And commenting out the line
        case ' ':
in winemenubuilder.c in escape() also works around the bug.

Are there programs that rely on spaces being escaped in fdo desktop entries?