ii have office 2007 too and can't open mdi files, but here's a link to install the microsoft document imaging from windows 7 or vista.
support.microsoft.com/kb/926198
just realized that i cannot post links, so just copy and paste
I downloaded and opened the folders with WINRAR. But what programs should i use to open the midi files? I could only open the word file, which only has the the answers. Thank you.