Theoretically, it should be possible to convert MS Access .mdt files to CSV format, but only if the template already contains some kind of data. That is usually not the case, so this conversion does actually not make much sense.
Convert Microsoft Access database template to Comma Separated Value.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert mdt to csv on Windows
A relational database management system from Microsoft Office
Convert from mdt file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.