JT open CAD format (*.jt) is not well supported in traditional CAD programs, so the only way to convert it to something else would be to find a dedicated CAD converter like the CrossManager.
Convert JT Open CAD 3D model format to SolidWorks assembly data.
We found 2 software records in the database related to .jt to .sldasm file format conversion.
Microsoft Windows software - convert jt to sldasm on Windows
A CAD converter with huge format support
Convert from jt file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jt to sldasm. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A CAD visualizaton, analyzation and translating system