The "IP_OD1" prefix and "Set40" suffix suggest a versioned collection of data. This format is common in: Used for emulators like MAME or FBNeo.

Open with a text editor (Notepad++) to read the metadata. This often contains the "Project Name" or "Hardware Version" intended for the set. If you see .dat or .db Category: Database/Mapping.

Always run a virus scan on compressed files from third-party sources before opening.

💡 Treat this as a technical data package rather than a standard media file.

"Set 40" might require "Set 39" or a "Base Set" to function correctly if it is an incremental update.