Download and install the 7-Zip File Archiver. While other tools like WinRAR may work, 7-Zip is the native utility for .7z formats.
Right-click specifically on the .001 file and select 7-Zip > Extract Here (or "Extract to [folder name]"). JFV.7z.001
All parts must have the exact same base filename (e.g., they must all start with JFV.7z ). If one is renamed, the extraction will fail. Download and install the 7-Zip File Archiver
Large files are often "split" into smaller chunks (e.g., .001 , .002 , .003 ) to make them easier to upload, email, or store on limited-capacity drives. or store on limited-capacity drives.