To access the content, you generally cannot open the .001 file alone. You must follow these steps:
: Right-click on the .001 file and select "Extract Here." The software will automatically find the other parts and reassemble them into the original full-sized file.
: You will need all subsequent files in the set (e.g., .002 , .003 , etc.) saved in the same folder .
: Use software like 7-Zip (Windows) or The Unarchiver (Mac).
: This is the primary extension for files compressed with the 7-Zip open-source archiver.