A file mask that determines which files and directories match the rule.

This property reflects the file mask used to determine whether a file or directory matches the rule. In addition to being its primary match qualifier, a rule's mask also serves as its identifier; every rule in a ruleset must have a unique mask.

Note that when a rule with a drive letter is added, said drive letter is automatically converted to NT Device format, so this property's value will contain the NT Device name. To determine a drive's drive letter, use the GetVolumeGUID method to obtain its volume GUID, then enumerate its mounting points (which will include any drive letter(s) associated with it).

A file mask that specifies where matching files and directories are redirected to.

This property contains a file mask that specifies where files and directories that match Mask are redirected to. Please refer to the Reparse Rules topic for more information.