[Fixed]Halo Combat Evolved crashes with PAL

Hi everyone,

I want to make Halo Combat Evolved (not Custom Edition) Portable.
There already is a launcher out there but since it's written in autoit3 and it doesn't backup the registry and such I wanted to do better. The only problem is that Halo doesn't like it when a process is attached to it, then it throws an exception, gathers data and closes/crashes.
This wasn't the case with the already existing launcher, I don't know why.

I already made a launcher in Autohotkey(a fork of AutoIt3), the game started normally, but it couldn't handle registry key as good as PAL. I tried to convert it to PAL. This works, all the registy keys/save files are backed up, but now the game crashes on startup. This doesn't happen when I start the normal game exe, so it should be caused by PAL somehow.
Does anybody have any idea what's the cause of this problem or how I could solve this problem?
Maybe custom code?

Thanks for your time!

AHK (Basic) code that worked (I suppose only only the launching of the exe is important):

; gameexe was halo.exe
; gamepath was A_WorkingDir
Runwait, %gameexe%, %gamepath%

launcher.ini

[Launch]
ProgramExecutable=Halo\halo.exe
WorkingDirectory=%PAL:AppDir%\Halo
LaunchAppAfterSplash=true
RunAsAdmin=force
SinglePortableAppInstance=true

[Activate]
Registry=true

[RegistryKeys]
haloHKCU=HKCU\Software\Microsoft\Microsoft Games\Halo

[RegistryCleanupIfEmpty]
1=HKCU\Software\Microsoft\Microsoft Games

; [FileWrite1]
; Type=Replace
; File=%PAL:DataDir%\settings\aomx.reg
; Find=%PAL:LastDrive%
; Replace=%PAL:Drive%

; [FileWrite2]
; Type=Replace
; File=%PAL:DataDir%\settings\aomx.reg
; Find=%PAL:LastPackagePartialDir:DoubleBackslash%
; Replace=%PAL:PackagePartialDir:DoubleBackslash%

[DirectoriesMove]
MyDoc=%DOCUMENTS%\My Games\Halo

[DirectoriesCleanupIfEmpty]
1=%DOCUMENTS%\My Games

custom.nsh (needed to register the latest msxml files)

${SegmentFile}

${SegmentPrePrimary}
    ExecWait 'RegSvr32 /S "$AppDirectory\Halo\msxml4\msxml4.dll"'
!macroend

${SegmentPostPrimary}
    ExecWait 'RegSvr32 /U /S "$AppDirectory\Halo\msxml4\msxml4.dll"'
!macroend