Rather than creating these data files "manually", WinDev, WebDev and WinDev Mobile allow you to export the content of the window (or page) to automatically create the corresponding structure of the data file.
The type and the size of the item depend on the type of information displayed in the control (text, numeric, ...) and on the input size.
All the characteristics of the control are used in the shared information of the item.
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All you have to do is configure your product as follows: