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As the topic, I would need something that can open .mdi files. I tried Microsoft Office Picture Manager and Picture and Fax viewer but no luck. Only .tif files can be opened.

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Not sure on third party software, but the official application is Microsoft Office Document Imaging (Office 2007+) to open the files. – William Hilsum Nov 19 '10 at 19:11
I have Office 2003 – r0ca Nov 19 '10 at 19:12
Pretty sure it's included in Office 2003 as well, not 2007 only – davr Nov 19 '10 at 20:23
up vote 3 down vote accepted

The official page about Microsoft Document Imaging Format (MDI) states that MDI files can only be opened or edited in Office Document Imaging. If you have this utility but can't open .mdi files with it, try the resolutions given in the following Microsoft article:

KB 926198: "An .mdi file does not open in the Microsoft Office Document Imaging program that is included in the 2007 Office programs"

Alternatively, a quick Google search brings a 3rd party program which is a free tool that can view .mdi files: MDI Viewer 1.0.32

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