MDI missing

[SChINheE]

I have some documents that need to be open by Microsoft Office Document Imaging Viewer but recently I found that it has disappeared from my Open With program. So I've tried to add it back on to it but it just won't show itself. I have no problem to add other program like Microsoft Office Document Scanning.
Any ideas how to get it showed on the Open With program so I can default it to open my document? Thank you very much.

 

[SChINheE]

Hi, I've found the cause. When I open 'Folder Options' and click on 'File Types', I will need to change the setting on the 'Advanced' under 'Details for 'xx'file type' in stead of directly click on 'Change'. Select 'New' and fill in the 'Action' and 'Application used to perform action'.
Thanks anyway.