Broken doublepane window
99% of the time you will have to get a new window or at least a sash of the same size but you will have to know the manufaturer of the window. You should be able to look at it and do a little prying here and there to see if anything will pop loose to let the glass come free. If you can get the glass out most glass shops can build a double pane window glass to fit but they will need the size of the old and the overall thickness of it also.
Do one thing at a time, do it well, then move on.
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