: Check that the file sizes are consistent (except for the last part). If a file like Irk16.7z.002 is significantly smaller than the others (unless it's the final piece), it may be corrupted or incomplete.
: The header or "master" file required to initiate extraction. Irk16.7z.002 : The second sequential data block.
How to Extract Multiple 7ZIP Files at Once [.7z.001 .7z.002 .7z.003...]
Files with the extension .7z.002 are "split volumes" created when a large 7-Zip archive is broken into smaller pieces for easier sharing or storage.
: Open only the first file ( Irk16.7z.001 ) with your archive software. The program will automatically detect and pull data from Irk16.7z.002 and other numbered parts to reconstruct the original file.
Do you need help of the Irk16 archive or troubleshooting a specific extraction error ?