how to open an stp file in Autodesk Inventor with default options of windows

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we have just installed The Autodesk 2016 Suite with Inventor 2016 on our computers. some users when they right click on a stp file and try to open it with a right click and select "open with" they are not able to open the file with inventor or when they browse to Inventor shortcut or the Inventor program they are still not able to open the stp file with Inventor. we only have inventor 2016 installed. Inventor 2014 has been uninstalled. we can still open stp files within Inventor 2016, but not by right clicking the stp file and selecting open with. Does anybody have any idea how to resolve this issue. I have several users who would be greatlful to a solution to this. My E-mail is seandulac@westerntrailer.com Thank you for your help with this.