If the extraction fails, you may need the other "pieces" (e.g., Set37, Set39) if it is part of a split archive.
Files containing "OD" often refer to "Original Designs" or specific modular terrain sets for games like Warhammer or D&D. IP_OD1_Set38.rar
Do you know the (e.g., architecture, gaming, engineering)? If the extraction fails, you may need the other "pieces" (e