They will work but aren't totally flat. I was able to route them around the jam of a sliding glass door with some difficulty. If you have any complex window seals, you may not be able to close your window.
Well, I never had a problem with mine despite opening and closing the windows and doors a lot, and never had a problem with being able to close those windows and doors. The flat cables worked perfectly for years. I guess YMMV, but if they're a risk, I'd definately say they're a good one.
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