Ok some info, not necessarily important to the solving this game but I found it interesting non the less. I was and trying to see if moding the ini files did anything and at first it didn't appear to however after I erased the Data\DPTG.exe line from selurl1="Data\DPTG.exe" the game gave me this message
So I specified a different dir, in this case selurl1="Data\Quake 3\ioquake3.x86.exe" it ran quake. So As far as I can tell this main exe only works as a shortcut. I also tried what Arteca suggested
"you can mix and match .dat and .exe freely in this manner and it will work so long as they have the same name."
And yea I renamed the exe and dat to DPTG2 and it worked. Also the .dat files from from the other games are interchangeable in this way as well. Hopefully someone can find a way to access the archived data in the .dat files I have been trying but not luck so far.