Advanced Search Filtering options are as follows:
•Search system files / folders - Indicates that system files and folders should be included. Off by default.
•Search hidden files / folders - Indicates that hidden files and folders should be included. Off by default.
•Search sub folders - Indicates that subfolders should be searched recursively. On by default.
•Case sensitive masks - Indicates that filename masks should be treated as case-sensitive. Off by default.
•Skip zero-length files - Specifies that zero-length files should be skipped. On by default.
Tip: You should leave the advanced options at their default settings unless you have a good reason to do otherwise.