Based on technical databases and community forums, this specific naming convention is frequently found in:

Sites like simHeaven use split .7z files for massive terrain data, such as the zOrtho-XP12_+49+008.7z orthophoto tiles.

Always scan unknown archives using tools like VirusTotal before attempting to extract them.

.7z represents an archive created with 7-Zip , known for its high compression ratio.

Look for a .001.7z file in the same directory; the metadata in that first file will usually reveal what the overall archive contains.

If you found this file on your computer and don't recognize it, it is likely a leftover from a large software or mod installation. To verify it safely: