Files from unofficial sources with military-style naming conventions should always be scanned with VirusTotal or similar antivirus software before execution.
Based on the filename pattern, appears to be one segment of a multi-part compressed archive, likely related to a flight simulation or military training digital asset released around October 22, 2019 (GF191022). Context and Origin The acronyms in the name suggest it may be linked to: GF191022-ULOTC-FLT.part13.rar
University of London Officers' Training Corps - The British Army How to Use the File Are you attempting
This indicates that you need all preceding parts (part01 through part12) and any subsequent parts in the same folder to successfully extract the contents. How to Use the File including Part 13.
Are you attempting to or looking for the rest of the file parts ?
Open Part 1 using a tool like WinRAR or 7-Zip . The software will automatically bridge the data across the other segments, including Part 13.