Hi Vlado,
MS Office 2003's Document Imaging is the app that creates
..MDI files, unfortunately it's also the only one that can
display them for viewing. Ask the sender to save the
file in .TIF or other graphic format for you and resend
if you do not have Office 2003.
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I received a file aImage.mdi in my e-mail. How do I open it???
Windows XP says it cannot open this file, it does not know what program
created it. >>
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Let us know if this helped you,
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
For Everyday MS Office tips to "use right away" -
http://microsoft.com/events/series/administrativetipsandtricks.mspx