Track1.7z.001 -

: To access the data inside, you must have every subsequent part in the same folder. Missing even one part will result in an "Unexpected end of data" error during extraction. How to Open It How to Extract .7z.001 files - Microsoft Q&A

: The .001 extension indicates that a large file was broken into smaller pieces for easier sharing or storage. track1.7z.001

The file is the first part of a split 7-Zip archive. Because it is a split file, you cannot "review" its contents until it is recombined with all other parts (e.g., .002 , .003 ). Understanding the File Type : To access the data inside, you must