not working for me:
In the postal1.lha > POSTAL.INI is a Line: File = res/levels/postal_plus_realms.ini
In res/levels/ is a file called: postal plus realms.ini without "_" in the name

First Test i click on postal1-mos Error Code Shows

Second Test: i renamed File in POSTSL.INI to. "res/levels/postal plus realms.ini"
Error code shows again

Third Test:
I renamed File in res/levels/ from postal plus realms.ini to postal_plus_realms.ini
Error code shows again

What is wrong with that?