# QVX file format

A QVX formatted file describes a single table followed by the actual table data. The file includes:

* An XML formatted table header (QvxTableHeader) written in UTF-8 character set. The header describes the fields in the table, the layout of the subsequent data together with some other meta-data.

* 0 byte written at the end of the table header, i.e. directly after </QvxTableHeader>, and before writing the actual data.

* The actual data formatted according to the preceding table header.

  ![Illustration of file format structure: predetermined table header, 0 byte at end of header, and then actual table data](https://help.qlik.com/en-US/qlikview-developer/September2026/Subsystems/QVXSDKAPI/Content/Resources/Images/ui_QVXTableHeader.png)