Combine multiple PCXM (Password protected) file in single PCXM file. - open to bidding

(Its surely not a PCX file which is a image sort of a format). Kindly join these files so that we can import it to the given software to modify the data through the software. I had tried to join these files to 1 file but after rejoin when i import it to the software it only shows the content of the first part only. I want that it should show all the content in that single file.