This post talks about what is an STP file and how you can open such files in Windows 11/10. STP or STEP is a 3D assembly file saved in Standard for the Exchange of Product Data (STEP) format.
I've got an employee who has received a file from a client in the filename.sop format. I've googled this to death and can't find anything to open it with. The client we received the file from said it ...