Files from unofficial sources can be risky. It is recommended to scan the archive for malware and verify the file's hash (MD5/SHA) if the source provided one.
To open this file, you generally right-click part1.rar and select "Extract Here." The software will automatically pull data from part2.rar and any subsequent parts to rebuild the original game file. Tactics Ogre Reborn (XCI).part2.rar
Once extracted, the XCI file is typically used with Nintendo Switch emulators (like Ryujinx or Yuzu) or on modified Switch consoles. Files from unofficial sources can be risky
Tactics Ogre: Reborn , a remastered version of the classic tactical RPG. Tactics Ogre Reborn (XCI).part2.rar
XCI is a file format used for Nintendo Switch game cartridges.
.part2.rar indicates this is the second part of a multi-part RAR archive.