If you are looking to document or describe this file for a personal archive or a tech community, you could use the following:
That filename looks like a very specific (an iOS application archive) for a modified or "cracked" version of Grand Theft Auto III . Based on the naming convention, File Name Breakdown If you are looking to document or describe
Are you trying to get this specific version running on a modern device, or or : Likely version 1.x
: Likely version 1.x, with "unk" potentially meaning "unknown" build or a custom modification. If you are looking to document or describe