This control sequence causes Directory Opus to display an Open File dialog, letting you select a file. The name of
the selected file is then inserted into the function. You can also optionally supply the title string for the file dialog
and a default value for the filename. This is done using the vertical bar inside the control sequence itself. For
example,
{dlgopen|Select filename|dopus.txt}
This would use Select filename as the dialog title, and the default filename would be dopus.txt.
So normally, i can choose only dopus.txt files ? So why i can see and select all files ?
It says the default filename would be dopus.txt. In other words, when the dialog opens the filename will be set to dopus.txt which you can then edit or replace, or just hit return if you want to specify dopus.txt
It doesn't say anything about filtering what else is shown.