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All the files have extensions 001, 002, 003, 004…., how can I join them???
These files are the parts of a single file, you need to use a free utility called Hjsplit (Download it here) to join them, its only 600kb. Put all the parts in the same folder and select the first part in Hjsplit and click join. The utility will find other parts and join them to give you a single file.