When a file is split into multiple parts (Part1, Part2, Part3... PartN), all parts are fragments of a single whole. If you try to open part2 independently, extraction software will immediately throw an error: "You need the following volume to continue extraction" or "The archive is corrupt."
The archive is likely a split volume format ( .r00 , .r01 ). Rename mdl00102part2rar to mdl00102.r01 if WinRAR does not recognize it automatically. mdl00102part2rar best