it wasn't hard to copy different language files to one folder, but now i have one with x86 files and another folder with x64 files. is it somehow possible to merge them (to save an extra dvd)?
I have never done it personally but if you want you can make a DVD Autoplay menu that has 2 buttons, one to call the x86 setup and one to call the x64 setup and just have both the x86 and x64 content in the DVD but you may need a DL DVD depending on what copy of office 2010 you want to copy. There is a program called "Ashampoo MyAutoplay Menu" which is really easy to make autoplay menus if you want to try it out. Unfortunately it is not freeware but we all know ways around that lol.
Microsoft has managed to make ONE DVD with both 32bit and 64bit of Office 2010, so it's possible.... en_office_professional_plus_2010_x86_x64_dvd_515529.iso
Stainemann's channel switcher tool should also be able to do that and create an iso at the end of it.