Dear Maria Amalia,
For certain programs I know that Apple has constructed a route for us to do that. The one I have used is to convert KEYNOTE into POWERPOINT...the Mac slideshow program into the PC one.
There is something for PAGES also, converting to WORD, but in my experience that does not work too well; better to just copy (using a common font) and paste into a Word file.
*** If there is some universal method for any Mac program into Windows, I do not know about it and maybe someone more expert than me will see your Q...