True, but that part of the post you left uncommented and us wondering what you think of such solution.
You might think that the solution i provided is something large scale, but the truth is that it took me about 10 minutes to write the programm and a few more to test the whole thing - probably about as much time spent as for every average answers to threads that i give on here.
I take it, however, that you don't like the solution as you dislike the idea of renaming files etc. - that's OK.
For the JNGP thing:
You see, if you go and tell someone that you have problems eating your soup as the strokes you take keep rinsing through the gaps of your fork, this someone will likely tell you to use a spoon instead.
If you answer that with "I am not using a spoon.", it will likely make the other person seriously wonder about the reasoning for this.
I take it that you have some kind of personal aversion against this tool, and that's it. But it should not surprise you when people take a few posts to realize that there will be no convincing.
As for your problem:
I think all possible solutions have been listed and discussed. There will be no part of the standard WE that allows you to add "-window" to it in order to achieve what you desire.
I guess at this point its up to you to decide which route to go, be it using one of the suggested solutions or just forgetting about the gimmick.
If you were able to write a stand-alone converter from obj/3ds to mdx or mdl, even if it only supports mesh and texture coordinates, then I would kiss your feed, but that's another story.
Hehe, backed up by the time of internet such thing would definitely be possible, but as with everything, time is the lacking factor. That, or money.
However, are you sure there havent been solutions to this provided somewhere?
If this is a somewhat common thing to do then it should be somewhere out there - at least a quick google search has suggested so.
But there might be more to it than i am aware of - when it comes to moddeling etc. i am more than clueless.