The file is the first part of a split 7-Zip archive .
Do you have the (like .002 or .003) for this file, or are you seeing an error message when you try to open it? How to extract part files 001 using 7zip on windows (2026) AMCRZ.7z.001
If you only have the .001 file and the archive was originally split into multiple parts, attempting to extract it will likely result in an error because the remaining information is missing. The file is the first part of a split 7-Zip archive