DFX and DST files were used in now discontinued Micrografx Designer and if any program could work with them and perhaps convert them, it would that software. We couldn't find anything specific about this conversion, so if you know anything, please let us know in the discussion below.
Convert Micrografx Designer effects file to Micrografx Designer template file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert dfx to dst on Windows
Micrografx Designer was a software for creation of engineering drawings. It was later sold to Corel and its successor product is now available as Corel Designer Technical Suite.
Convert from dfx file
to dst file
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.