When a file is saved in SOLIDWORKS, the major version that it was last saved in is recorded as a custom property, as shown in the image below:
Display SOLIDWORKS File Version
This custom property can be displayed directly in the Windows Explorer detail view so that you can have it at a glance without having to select each file. Follow the two step process below:
Step 1: In a Windows Explorer folder set to a Details view, right click on the column header bar and select “More”
Step 2: In the Choose Details dialog, select the box for “SW Last saved with” and click “Ok“.
The last major version that the file was saved with will now display directly in the detail view, as shown below: