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A file with the extension is the first part of a "split" or multi-volume archive created by 7-Zip . To extract it, you must have all sequential parts (e.g., .002 , .003 ) in the same folder.

If you are looking to —meaning you want to split a large file into smaller parts like the one you have—follow these steps: How to Create Split 7-Zip Archives 65_Post.7z.001

Right-click the large file or folder you want to compress. A file with the extension is the first