Because CAD files contain high-fidelity geometric data, they can become quite large. Compressing them into a .zip archive (resulting in filename-prt-1.zip ) makes them easier to:
Are you trying to one of these files, or are you looking to create a specific CAD design yourself? trajpar - PTC Community Prt1zip
The first version is saved as filename.prt.1 , the second as filename.prt.2 , and so on. Because CAD files contain high-fidelity geometric data, they
Reducing file size is essential for passing through corporate email gateways. the second as filename.prt.2
If you download a prt.1.zip file from an academic source, be aware that files created in the cannot be opened in the Commercial Edition . This is a security measure to prevent student licenses from being used for professional work.