...But that's not all. I decided to use another online Quest game, to see how the online player handles the files.
I was able to open this image multiple times, using the same address each time, and the online player seems to use the definite address of the file, not the "quest://" one. Then things got interesting...
I decided to use that JS.eval method using the address of an online Quest game.
Interestingly, it opened the game in the player window, but did not overwrite the previous game's output. The link I had made to the local file was still there. I decided to click on it, and...
The link, which before, did nothing at all, now opened the correct page (albeit as raw code), in a completely separate window! I don't know what this says about Quest's player, but it seemed too relevant not to post.