HOW TO USE osu_converter:
1) Prepare .osu files of the beatmap you want.
2) Launch IAVT_osu_converter.exe from command line with parameters: osu_file.osu output.txt <offset>.
3) Rename the output file into "MXXX_DY_MID.txt" where XXX is the ID of the song (you can go to /outputfolder/resource/common/songs/ and see it there), Y - difficulty (1 - easy, 2 - medium, 3 - hard).
4) Place the output files in /outputfolder/resource/common/songs/ and transfer everything to Vita.
I Did This but osu converter wont even open??. i have an osu file and i dont know how to convert it