The_MAZZTer and I looked at the Steam version of JK. The only difference is that the file, jk.exe, has been changed. The change seems to be added code at the end which decrypts the original code section that has been changed into encrypted data. I assume this is to prevent exe hacking.
What does this mean for us?
While typing this, I realized I don't know if the Steam version can be placed elsewhere to run separately from Steam. What I do know is that replacing the Steam jk.exe with the CD's jk.exe makes it exactly the same as the CD version (and can be moved elsewhere).
All unofficial patches do NOT work with the Steam version of jk.exe. I will be looking into ways of patching the Steam version. Most likely, I will have to add a new separate exe because it will be hard to patch the actual jk.exe and because Steam might update the jk.exe on its own, anyway.
As far as we can tell, addon levels and mods (as well as JKLauncher) should work with the Steam version.
Any music CD (including the original JK CD) will be played by Steam's JK, if a "CD Path" registry entry is added in the right place (not sure where at the moment).
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