Could someone please add Hq4xS by Mudlord to RetroArch

I Have found this shader filter called HQ4xS by Mudlord in Kega Fusion Emulator and I think it offers the best visual quality while staying true to the original Art and I have not found any way to transfer this filter to Retroarch, The filter has the extension .rpi which does not seem to work on RetroArch even tho some emulators have integrated the HQ4XS filter as well so can anyone please help, info about the filter: http://www.emutalk.net/threads/42706-6-New-Kega-Fusion-filters Link for Kega Fusion filters pack: http://www.emu-france.com/emulateurs/5-consoles-de-salon/58-sega-16-32-bits-hardware/2244-kega-fusion-filters-plugins/