The 1.3.3 version of phenix for Mac is available as a free download on our website. The software relates to System Tools. The actual developer of this Mac application is DoktorKleanor.com.
From the developer:
Phenix splits up a file into several bits and reassembles a split-up file. Possible use : to split a large file into smaller files to be sent by e-mail. What's New
You may want to check out more Mac applications, such as PHENIX home, which might be related to phenix.