.WEBHISTORY File Extension
What is a WEBHISTORY file?
File created by Safari, a Web browser for Mac OS X; saves data for a visited Web page, including the Web page's title and URL; used for remembering visited websites and auto-completing Web addresses as users type them in the address bar.
More Information
By default, WEBHISTORY files are saved to the following directory:
[user]/Library/Caches/Metadata/Safari/History/.
Programs that open or reference WEBHISTORY files
Mac
Included with OS