: This indicates that the file is the first part of a split archive . You cannot extract or view its contents without having all the other sequential parts (e.g., .002 , .003 ) present in the same folder.

: Use a modern archive utility like 7-Zip or WinRAR.

: Right-click on the .001 file and select "Extract Here". The software will automatically read the sequential parts and output the original complete file or folder.

: Ensure you have downloaded every associated file part belonging to the set in the exact same directory.