Conversion from Unigraphics to Onshape is not supported yet :(

Unigraphics is a former name for Siemens NX, an advanced CAD/CAM/CAE software application suite. However, veterans are still using the Unigraphics name.

In 2002, the new version of Siemens Unigraphics, merged with I-DEAS software, was released and called NX, which means "Next Generation". In fact, it was the last version of the software released under the Unigraphics name. All further releases became known as NX. So the addition of I-DEAS functionality to the core code of the Unigraphics has become the basis of the existing NX product line.

Siemens NX / Unigraphics use a .prt extension, which contains 3D CAD parts.

Onshape is a CAD software system, delivered via internet. It is focused on mechanical CAD and is used for product and machinery design in many industries, such as electronics, machinery, medical devices, 3D printing, machine parts and industrial equipment.

It makes use of cloud computing, with computer-intensive processing and rendering performed on Internet-based servers. Users are able to interact with the system via a web browser or the iOS and Android apps.