[Bug 15578] New: Px-map crashes (probably caused because reading registry-key fails)

http://bugs.winehq.org/show_bug.cgi?id=15578

Summary: Px-map crashes (probably caused because reading
                    registry-key fails)
           Product: Wine
           Version: CVS/GIT
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: advapi32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

The application crashes somewhere in a function called GetDefaultBrowser. The
cause is probably the following:
0009:Call advapi32.RegOpenKeyExW(80000000,00886d88
L"\htmlfile\shell\open\command",00000000,00020019,0032f238) ret=0036ab8f
0009:Ret  advapi32.RegOpenKeyExW() retval=000000a1 ret=0036ab8f
0009:Call KERNEL32.InterlockedCompareExchange(00855858,00000004,00000008)
ret=79ef56cc
0009:Ret  KERNEL32.InterlockedCompareExchange() retval=00000008 ret=79ef56cc
0009:trace:seh:raise_exception code=c0000005 flags=0 addr=0x4011830
0009:trace:seh:raise_exception  info[0]=00000000

Reading the registry-key fails with ERROR_BAD_PATH (000000a1) because the key
starts with a backslash "\htmlfile". There's even a test for this:

/*  beginning backslash character */
    ret = RegOpenKeyA(HKEY_CURRENT_USER, "\Software\Wine\Test", &hkResult);
       ok(ret == ERROR_BAD_PATHNAME || /* NT/2k/XP */
           ret == ERROR_FILE_NOT_FOUND /* Win9x,ME */
           , "expected ERROR_BAD_PATHNAME or ERROR_FILE_NOT_FOUND, got %d\n",
ret);

Whereas this might be true for opening a key under HKEY_CURRENT_USER, it seems
to be wrong for a key under HKCR, if you change the test to opening a key with
a heading backslash under HKEY_CURRENT_ROOT it just seems to work fine (on
winXP). Wine should'nt  probably fail as well.