writing value Error in PortableApps.com Launcher

Hi
I searched in this forums did not find my Qusetion.
I want to ask. how to write value when value is string type. in PortableApps.com Launcher
suhch as
[Activate]
Registry=true
[RegistryValueWrite]
HKCU\Software\AppName\Key\Value2=REG_SZ:AppName ;Value2=$AppDirectory\AppName\App.exe

I tried this one also but did not work
HKCU\Software\AppName\Key\"$AppDirectory\AppName\App.exe"=REG_SZ:AppName

but write wrong value in registery
like: HKCU\Software\AppName\Key\$AppDirectory\AppName value=App.exe
but myvalue is "$AppDirectory\AppName\App.exe"
If enybody knows help me.
thanks