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everytime i download the windows version, they ask me what program do i want to use to open the rar doc. but the two version for linux and max seem to be zip like regular VN.

how am i supposed to do?

You should have WinZip or WinRAR. Any of these can open .zip files. When I create the .zip file I use the same program for both windows and Linux. There is a possibility that you changed the file format when you downloaded the game. No matter though if you use any .zip program you can unpack the files and play them.