The word document is not "running" Doom (the actual work is done by a dll that is included in the word document). The word document is instead used as a screen (never thought I'd wrote that) to display each frame.
The question is, what else can you call from the dll. Doom is self-contained, so the VBA just passes the inputs to it and gets a new image back. The dll also has to match the architecture, right? So not portable.
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[ 2.6 ms ] story [ 35.2 ms ] threadAll and all looks like the guy is an expert on porting doom so good for him