Was sent a few files that are split, requiring a "joiner" application. The files first come in zipped portions, that I unzip and extract the xxxxx.part1.rar file until they're all in the same directory. I've used UnRarX, Stuffit Expander, Archiver, HJSplit, Split and Concoct, searched through forums - can't join them. I sense this is a Yosemite issue, but if anyone can help I'd greatly appreciate it! Thanks!