Solid Edge supports export to plenty of other 3D modeling / CAD formats, including the exchange STEP format (.stp, .step). This means that it should be possible to convert dft to stp using Solid Edge and perhaps some other, 3rd party alternatives with support of Solid Edge's format.
Convert Solid Edge drawing file to ISO-10303 STEP product data.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert dft to stp on Windows
A feature rich 3D CAD software by Siemens
Convert from dft 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.