Multi-part RAR archives are created using a "spanning" method. When a source folder exceeds a certain size—often to meet filesystem limits (like FAT32) or email attachment restrictions—the compression software splits the data into numbered segments.
Use WinRAR, 7-Zip, or The Unarchiver (macOS) to process the files. Open the first part, and the software will automatically "stitch" the segments together to reveal the internal files. fla0105.part2.rar
If available, compare the MD5 or SHA-1 hashes of the file to ensure it wasn't modified during transfer. Multi-part RAR archives are created using a "spanning"