Notes about the XMC file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The XMC file type is primarily associated with 'Expression Media' by Microsoft Corporation. Microsoft Expression Media is a commercial digital asset management (DAM) cataloging program for Microsoft Windows and Mac OS X operating systems. It is the next version of iView MediaPro which Microsoft acquired in June 2006. XMC is the catalog format of Expression Media. Even when your originals are offline you can browse, search, and annotate your digital files.