Project files (.prj) that contain 3D models / parts (usually from older programs) may perhaps be imported in some of the more recent 3d modeling tools and exported to some of the exchange data formats, including Collada 3D Digital Assets format (.dae).
Convert Project file to Collada 3D digital asset exchange data.
We have found 3 software records in our database eligible for .prj to .dae file format conversion.
Microsoft Windows software - convert prj to dae on Windows
A graphics design tool for making 3D landscaping and animations
Convert from prj 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 prj to dae. 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.
Apple macOS / Mac OS X software - convert prj to dae on OS X
3D modeling and animation package for Mac.
On-line services software - convert prj to dae on web
A free online 3D model conversion service