.DMGPART File Extension

Partial disk image file used by the Mac OS X operating system; contains a portion of a .DMG file that has been split into multiple partial archives; often used for distributing software over the Internet in smaller download sizes instead of one large download; also used for making file sizes that fit onto CDs or DVDs.

DMGPART files are usually provided with a corresponding DMG file, which is the master file for the split archive. You can open this DMG file to install the software.