To be able to use the custom mansions that were built for the original Midnight Mansion game (MM1) they have to be converted.  We, the admins, are testing all the original MM1 cm's and will eventually upload them in HD ready format to the same download pages where the original MM1 cm's are stored.  We will also make a list of the HD ready cm's with links to their download pages.
Note that we will not make a new category for talk about individual MM1 HD cm's.  Instead we will use the same category that hosts the boards for talk about individual, original MM1 cm's.

Note that you can convert your old cm's yourself but they may still not be playable due to some changes in the game engine.  The faq also explains how to convert mansions with custom graphics which is a rather difficult job.  We, the admins, will not spend our time on fixing custom graphics in original cm's to make them work in the HD.  We will, however, try to contact the authors and ask them if they are interested in doing that for us.

Speaking of the FAQ, it is here:

http://www.actionsoft.com/games/midnightmansionhd/faq.php#ExportCustomMansionToHD

Thanks, Vern, I forgot to include the link.