The native tool for this format. Right-click the .001 file and select "Extract."
If you downloaded this file from an unknown source, it is highly recommended to scan it with a tool like VirusTotal or Hybrid Analysis before opening, as split archives are occasionally used to bypass basic email or browser security filters for malware.
If you can tell me or what software/hardware it is supposed to be for, I can give you more specific instructions on what to do with the contents.
The file is the second part of a multi-volume compressed archive created using the 7-Zip utility.
Once you have all the parts, use one of the following tools to extract the actual data:
Compressed archives of personal or system files.
To "develop" or access the content inside this file, you generally cannot open it on its own. It is a piece of a larger puzzle. Here is how you can handle it: 1. Collect All Parts