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From Odwiki

A cpio archive are collapsed directory structures which are available on most standard unix systems.

Most *nix systems are shipped with a command line tool (cpio) which can be used to manipulate .hip files. This tool can be used to extract all the files comprising a .hip file into individual files. These files can then be used to reconstruct the .hip file.

There are two tools shipped with Houdini called hexpand and hcollapse to expand a hip file into it's constituent parts or collapse all the parts into a single hip file. On most unix systems, these are simply shell scripts which call the cpio system command. On Windows, these are compiled programs.