This message requests that the server set a reparse point on the file or directory associated with the handle on which this FSCTL was invoked.

The message contains a REPARSE_GUID_DATA_BUFFER or a REPARSE_DATA_BUFFER (including subtypes) data element. Both the REPARSE_GUID_DATA_BUFFER and REPARSE_DATA_BUFFER structures begin with a ReparseTag field. The ReparseTag value uniquely identifies the filter driver that creates/uses the reparse point, and the filter driver processes the reparse point data as either a REPARSE_GUID_DATA_BUFFER or a REPARSE_DATA_BUFFER, depending on the structure implemented by the filter driver for that type of reparse point.

This message is applicable only to a file or directory handle, not to a volume handle.