OP, if this was a DIY, peel and stick type film I am guessing you will be in for a lot of quality time with a shaving blade-based tool to carefully remove the film, and then the glue residue. Most of the films I have seen use soapy water to attach the film to the glass and should come of and clean up easily. If you have an inconspicuous window, you might try removing a small area to see how difficult this job will be.
Your other option will be to start calling the various window tint companies and ask them if they remove old films, but I am guessing this will not be cheap.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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