We "convert" SolidWorks based files quite often to Pro/E files. SolidWorks 2005 writes out Pro/E files - parts andassemblies. It opens up seamlessly in Wildfire 2 (we are on datecode F000), obviously without any "editable" features.
I just wrote out a part from SolidWorks in *.x_t format (with setting parasolid release 13 - I do not know to which release Wildfire reads, the latest release is 15). The file was dragged into the Wildfire window and the part was created, all very smooth.
I think it all depends on which releases one sits regarding SolidWorks and Pro/E.