Knowing this can help me provide better guidance or alternative sources.
Ensure you are using reputable, safe sources for any file downloads. ot2000 MULTi.EXT.1080p.R-MG.part13.rar
If you only have part 13, you cannot extract the file. You must have all parts present in the same folder. To help you further, could you let me know: Where did you find this file name (a forum, tracker, etc.)? Knowing this can help me provide better guidance
You will need tools like WinRAR or 7-Zip to extract this archive. ot2000 MULTi.EXT.1080p.R-MG.part13.rar
generally implies multiple audio tracks or subtitles (Multilingual) and external subtitles/content.