This specific file name, , indicates it is a part of a split archive for a Nintendo Switch game update, likely "Super Robot Taisen (Wars) T" or a similar "SR" title, hosted on the site Ziperto. Quick Guide to Handling This File
: If you only have part 2, you cannot open or use the file. You must locate the corresponding part 1 from the original source.
The software will automatically pull data from part2.rar and the others to create a single file.
: If extraction fails, part2.rar might be corrupted. Try redownloading that specific part.