In the past 6 months or so, I have been having a issue opening ProE .prt files. It gives me a error that it is not a valid part file. I have always been able to open ProE files into Solidworks in the past, but something has changed. Either in ProE or Solidworks. I am receiving .prt files from multiple customers with the same error when I try to open the files. Has anyone else seen this, or have a solution for this?