So I imported a assembly from De-Sta-Co of a pneumatic clamp. Solidworks opens the assembly, but the parts are not really parts like in a normal assembly. There is an arrow on the part and assembly icons in the tree. I believe these are PRO-E / Creo parts that are imported because in windows explorer they have the .prt.1 extension. Is there anyway to get them to save as a regular solidworks part?