..  _fxtra:

FXTRA
=====

+----------+------------------------------------------------------------------+
| Syntax   | FXTRA [(#ch)] or                                                 |
|          |                                                                  |
|          | FXTRA \\file (Toolkit II only)                                   |
+----------+------------------------------------------------------------------+
| Location | Toolkit II, BTool                                                |
+----------+------------------------------------------------------------------+

This is a function which returns part of the file header relating to
the specified file (or the file attached to the specified channel
{default #3} if the first variant is used). See FGETH$ for what part of
the file header FXTRA returns. The Toolkit II default data device and
sub-directories are supported. If the first variant is used, the default
channel is #3.

**CROSS-REFERENCE**

See :ref:`fdat`, :ref:`fbkdt`,
:ref:`fupdt` and :ref:`ftyp`
which return similar information.