.MRK File Extension
File TypeDPOF Auto Print Order File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an MRK file?
Text file saved on digital cameras along with the digital images; describes the order the pictures should be printed in when printing pictures directly from the camera; used by digital photo printing services that support the Digital Print Order Format (DPOF).
The Print Order file is usually saved in the /MISC folder on digital camera media and is named "AUTPRINT.MRK."