I have seen references to this software in these forums and elsewhere.
It is my understanding that this is an old version of Moneydance pre 2011 and uses a .md file extension for the data files.
I have tested importing files that use this older data format into Moneydance 2019 and it worked without problem.
I would suggest you download Moneydance 2019 and us it in Trial mode to test out the upgrade, if you have access to a second computer I would use that otherwise completely backup your existing data and put it in a safe place in case of problems (We see occasional problems with upgrading across so many versions that require a different approach).
The folllowing articles talks about upgrading from older releases, while it uses Moneydance 2017, 2019 is the same process.
If you are happy after your testing you can purchase the software, the license key just unlocks the trial mode limit, which should have no impact on the upgrade process in any case.