Add 3DO Interactive Multiplayer support

[wizzomafizzo]

Summary

Add support for identifying 3DO Interactive Multiplayer games.

Background

The 3DO (1993) was a CD-based console with no copy protection or regional lockout. It uses a proprietary "Opera" filesystem rather than ISO 9660.

Technical Details

• Media type: Standard CD
• Filesystem: Opera (proprietary, NOT ISO 9660)
• Copy protection: None
• Regional lockout: None
• Boot process: Uses LaunchMe boot file

Proposed ID Method

1. Detect Opera filesystem signature
2. Parse Opera directory structure
3. Use volume label + LaunchMe file hash for unique identification

Implementation Notes

• Cannot reuse ISO9660 parser - needs custom Opera filesystem implementation
• Opera filesystem documentation is available
• LaunchMe boot file exists on every game disc
• Moderate complexity due to custom filesystem

Compatibility

• ✅ Readable by standard CD/DVD drives
• Higher implementation effort (new filesystem parser)
• Unique filesystem signature makes detection reliable

References

• Opera filesystem specification
• 3DO SDK documentation