OK then...
look in the root of your drive (usually C:\), for 2 .mis files called
MEDP1BCK.MIS and
MEDP2BCK.MIS
they will contain your lastest mission saves, if they are the ones you are after.
If you spend hours searching using CarpeDiem's advice with no results use my previous advice regarding K10 (also useful to have anyway), trust me I happen to know just a bit about it