Editing power upgrade costs, or, Why can't I open unlockables.xtbl?

So I'm restricting myself in the use of certain weaponry and upgrades for a challenge. I know there is a mod to make all the powers unlock with 1 cluster. I'm looking to do something of the opposite, make certain ones cost so much you can't get them, thus restricting their use, and then increase the power cluster costs on the ones to keep.

Now I'm no modder but I can tweak xtbl files, but for some reason BoJaN's SR:TT xtbl Editor just won't open unlockables.xtbl. I expected to just alter some numbers but I can't open the dang thingermabob. Is there some silly thing I'm missing to easily change these costs?
 
Imo,increasing the cost of the powers is risky.Let's say you collected all the data clusters and it is still not enough to buy a power upgrade,what would you do ? I think it's far more easy to just increase the cooldown to every power to a ridiculousy high value than increasing the cost.
 
Right, but that was the whole point. Remove the temptation to buy those powers buy making stuff like DFA Nuke or tiered upgrades beyond the first tier cost 999 and then figure out a rebalance. I was going more for toned down powers via trimming the upgrade tree than infrequent powers. Though that is a thought too.
 
It was too much trouble. Instead I have decided to simply buy 1 power per XP level, one per 2 levels after Lvl 10. Self control is doing the job for me by curbing my power increase.
 
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