XTND was a document import/export system developed by Claris for their products on the Apple Macintosh.
[5] The system proved popular and became a major selling point for Claris products, which were otherwise considered somewhat "low end".
In 1992 Claris gave the system to Apple,[3][6] who eventually re-branded it as a basic part of the Mac OS known as the Translation Manager.
XTND consisted of a simple runtime engine that listed, loaded and managed a series of "translators".
Almost all of the actual logic was located in the translators, the runtime simply handed off filenames and parameters to code stored inside.