When you receive a multipart file or archive, to join the data back to obtain the original file, move or copy all the parts of the file in the same folder before proceeding with extraction
	To merge spanned volumes or multi-parts, locate the first archive's part with Zip Extractor Pro, i.e. doubleclick on the first volume wich is usually identified with extension .001, .Z01, R01, .PART1 or similar - please note some times counter may have set to start from 000 (R00, Z00) instead. Now you can extract it with "Extract" or "Extract all" from Zip Extractor Pro's tool bar or context menu