Use a utility like WinRAR or 7-Zip . Select the first part ( part01.rar ) to initiate the full reassembly.

Likely indicates "Electronic Record Content" or a specific engineering release version (v10.81). 2. Technical Profile Specification Format RAR Archive (Multi-part) Integrity Check Requires all preceding and succeeding parts to be valid. Compression LZMA or PPMd (standard for RAR5) Known Associations

The filename follows a naming convention typically used in high-volume data distribution, where a large dataset is split into smaller segments (multi-part RAR) for easier hosting or transmission.