It looks like it works, too. I just tried it out on some random XM song I had around.
The only problem is that I don't think it supports some effect the XM was using, as one of the channels kept playing, but it's okay in Modplug Tracker. I don't think it supports cutoff/resonance in IT files, either.
Still, it at least can play XM files.
It looks like Construct uses MikMod. I wonder how hard it would be to get DUMB ( http://dumb.sourceforge.net/ ) to work with Construct.