Files with the .mgr file extension contain bitmap images. The MGR files are used by the XnView graphic and photo viewer. XnView is a free image viewing software application that can be run on a variety of operating systems. The MGR files can be exported into other file formats using the XnView software.
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If you have additional information about the MGR file format or software that uses files with the MGR suffix, please do get in touch - we would love hearing from you.