I am working of a file preparation software to enable translators work easily and efficiently on a wide range of file formats.
As far as text-based formats (xml, ph
Of course reverse engineering is possible, but without format specs it will take a lot of work. I would look at the return on effort regarding supporting these 'rarely requested, very expensive' formats. You may be better off spending that effort improving the core functionality of your app.
Another angle is to contact the companies with these formats, explain your goal, explain that it helps their product, and if they don't see you as competition they might be willing to help.