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I've drilled through the edge of window frames (holes parallel to and in between the double glazed panes) in the past. One hole at the top, one at the bottom, ventilate with an aquarium pump for a few days, re-seal with self tapping screws and rubber washers, remove the screws to dry it out again most summers...
MrE
@Chopsicle
Not as far as I can see - they're box-section alu frames, the glass slid into the 'H' section, with five + windows built/installed in one frame. I think they might be done like this because the building gets an absolute battering from the wind (hence the blown seals) and this prevents any chance of them working free.
....but, I could replace the opening windows (2 out of 5 panels) - and put up with the rest until they all get replaced in a few years.
The alu frames are ridiculous for thermal bridging/heat-exchange, so the need for proper vacuum sealed double-glazing is negligible.