Hi,
For changing the windows search indexing option you would have to go to the Windows Home Sever Desktop and right-click the Desktop Serach hourglass (Search options->advanced). That said I must warn you that going through the WHS Desktop is (1) unsupported and (2) changing any settings or installing applications could do harm to your server and data.
I do not think the search engine will be abled to index .mdi file. It uses special indexing filters (
IFilters) to index files and documents. I am not sure if WHS has the proper IFilter installed. And as far as I know only Windows Document Imaging installs filters to index .mdi files. Installing Office applications on WHS is something I would not advise....
- Theo.
No home server like Home Server