The file is the first part of a multi-volume compressed archive created using 7-Zip . The ".001" extension indicates that a large file or folder was split into smaller pieces for easier sharing or storage.
: You cannot extract the archive with just the .001 file. You need all subsequent parts (e.g., .002 , .003 , etc.) that were originally created with it. A1e5CRBGMSE 7z 001
: Every part must have the exact same base name (e.g., A1e5CRBGMSE.7z.001 , A1e5CRBGMSE.7z.002 ). How to Open and Extract How to Open and Extract .001 Files - Microsoft Q&A The file is the first part of a
: All part files must be stored in the same folder on your computer. A1e5CRBGMSE 7z 001