1. Navigate to your Alien Shooter revisited --> Maps directory.
2. Find and open CONST.LGC in a text editor, such as notepad.
3. Navigate to the line with the contents static int RT_SCREEN_X[] = { 800, 1024 };. This should be line 538. You can likely get there by just searching for "1024"
4. Replace 1024 and 768 on the line directly below with your desired resolution width and height. I'd recommend common sense here (I used 1920 and 1080).
5. Save and close the file. The game should run at the specified resolution without the HUD now.
6. To fix the HUD: find "gamebar1024.men" in the same folder, and rename it "gamebarXXXX.men", where XXXX is the screen width you put in earlier (in step 4). So, for me it is now named "gamebar1920.men".
7. just to be sure i replaced all the files with 1024 in the name to 1920.