If you have acquired a multi-part archive legitimately (such as downloading a large purchase backup split into blocks), you cannot extract part2 independently. You must process the entire sequence together:
The file is a specific segment of a multi-part compressed archive. Based on the naming convention (the "RJ" prefix), this file is almost certainly associated with digital media or software from DLsite , a prominent Japanese digital marketplace for games, voice dramas (ASMR), and doujinshi. 📂 File Breakdown H-RJ01219535.part2.rar