So when extracting those dat files we get out some wav audio files, and all of these .ilm files wich seem to contain image data, Example header:
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ILMI˜p..HDR 0...........(...¥...:...............................INDX.......€Pp..FRAMHp..FHDR............BMP 0p......¥.
I've never seen the format and opening it with FSViewer leaves a black screen.
Does anyone has an idea on how to get some vieawable images out of this files?

On a related note a software that most likely has been used to make games was Opus Pro. In the help there's a mention of ILM files, no documentation about the ilm structure or format though.
Example extracted files, From "Against the door" game dat file: https://drive.google.com/open?id=0BxHVcrywWokwamhLTGpHVEJwcnM.