Yes, that's exactly what I mean. I haven't tried it, because I don't have Downfall (and I didn't have much time lately), but I do expect it to work just like Cat Lady does.
And just to clarify a bit where this is coming from (since your first comments seemed a bit confused):
Chris Jones, after lots of protestation, finally began open sourcing the editor and engine code 3 years ago (kudos to him). People in the AGS community started cleaning up the code and making it run on Linux (there's been some problems on the Mac OS X front thanks to Allegro from what I've read, unfortunately).
Thanks to those efforts, The Cat Lady automatically works on Linux. Just point AGS to the Windows EXE containing the game archive. The only problem I've found so far is that, while it runs great on my desktop system, it's too slow on my older laptop, because AGS only does software scaling on Linux. Or at least it did a few months ago, no idea if that's already been changed/fixed.
So from what I understand, you would "only" need to repackage The Cat Lady and Downfall for Linux and test if everything works. Just drop in AGS compiled for Linux (32- and 64-bit), add precompiled libraries (like Allegro), and write a short wrapper script that looks if the system is 32-bit or 64-bit and starts the appropriate binary with the AGS archive (or hell, even the full old EXE) as a parameter. And then package it as a more Linux friendly tar.gz/tar.bz2/tar.xz/zip or whatever, BAM, finished, theoretically.
Would be very nice seeing a penguin here and on Steam for both games. :)
And while I can't speak for the AGS community or the subset working on the open source'd engine code, I'm sure they are happy to help should something be broken for either The Cat Lady or Downfall on Linux. :)
DrMcCoy
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Geek. Atheist+. Leftist. Metal-Head. Discordian. Lefty. ScummVM dev, xoreos lead. Software freedom zealot.