Tags
Tags let you associate keywords with documents to make it easier to search for them.
To tag a document in SolidWorks Explorer:
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Select a document on the File Explorer tab in the left pane or from the file list in the right pane.
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In the Tags field at the bottom of the left pane, click to display a list of tags that is already in use.
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Select a tag from the list or type a new tag.
To use a tag in a SolidWorks Explorer search:
In the Search box 
at the top of the left pane, type the tag and press Enter.
The Results tab displays the documents that you tagged, with the tag identified as a keyword.