xcomutil doesn't run on 64 bit win7 at all, so I guess that is out of the question, unless anyone has any ideas?
Hack into the savegame files the ability to build PsiLabs right from the beginning.
(I make this suggestion after having coincidentally spent some time, this weekend, going through the files. For what I believe the youth of today call "lulz".
I made (read: hacked together) a nice little cgi script for my local apache server to present savegame files in hex/ascii/numeric format across columns, highlighting differences/non-zeros, and from that worked out a lot of how the base inventories, layouts, economies, research levels, active mission maps/statuses, etc are done. And the irony is that I'll probably never (except for maybe one "super-cheaty-game" in which I max out my starting stats, just 'because') use it.)
Anyway, assuming we're still talking about UFO-EU (though the above could apply to any thing up-to/including UFO-AI), the main way of completing levels in a slightly cheaty way is to save just before starting a mission (allows you to roll-back and abort, or try a slightly less problematic map layout), just after starting a mission (for a given initialised map, lets you anticipate events you had to discover the hard way) and at any point thereafter when you are about to make a vital move (so if it fails, you can retry/do something else) or have successfully had a fluky shot that you don't want to lose when you
do find yourself forced to roll back.
Standard save-scumming, essentially, except that it's almost positively encouraged. Even moreso in UFO-AI, where an ended mission (succesful or not) gives you the opportunity to redo. I must admit that I probably overdid that, back when I played it, to get 'perfection' although (IIRC) you couldn't save/restart mid-game. (For UFO-EU, I particularly abandoned/reloaded mid-game when one of my HWPs 'broke', and the 'firing' tile zoomed off the edge of the board. An annoying bug, that I assume everyone has. And actually that's the reason I started thinking about hexediting. Not to actively cheat, but to correct 'broken' games. But whatever floats your boat!