Include Exclude Mask List Item2: The expression here makes use of the * wildcard operator to exclude all files in all subdirectories in all levels below the start path that begin with the string "_vti". When a specific file mask is not specified, *.* is assumed. For example, the subdirectory mask here, *.htm;~\*\_vti*\*\, is equivalent to *.htm;~\*\_vti*\*\*.*.