This is a really cool game, I dig the 'digital detective' vibe of searching through a filesystem for information, and the 3d maze was pretty surprisingly impressive.
The biggest issue I have with this game is that the windows are absolutely tiny and can't be resized, so I had my nose against the monitor trying to read some of those windows, especially the stop code for the last puzzle. (I'll admit, I got stuck and had to look at your post on the game page for a clue.)
Overall, very solid entry and excellent use of the limitation.