1. In File Explorer, Right Mouse Button. Click on a SolidWorks part file and select "Choose default program". 2. Assuming you have SolidWorks 2013 installed, you will see a pop up window asking "How do you want to open this type of file (.sldprt)?" and the option of either 'SolidWorks 2013' or 'SolidWorks Launcher'. 3. Make sure you tick the box titled "use this application for all .sldprt files". 4. Select SolidWorks Launcher.
Do I need to translate?
If it doesn't work:
A split installation will likely fix the problem by going to Start Menu > Control Panel > Fix.
If on the other hand SW is installed from an administrative image, it is not possible to repair, you have to uninstall and re-install...
During a multi-installation, you should know that the registration folders must be renamed as well as the toolbox folder. This avoids conflicts between different versions.