[Paraview] Reader plugin for files without extension

[Jérôme]

Hi,

I successfully created a reader in paraview that uses the
vtkDICOMImageReader. I used the hint "UseDirectory" in the xml, so
that the directory name is used instead of the selected file name.
My problem is : I have files without extensions !

How can I handle this ?
I am currently using this GUI XML :
<ParaViewReaders>
  <Reader name="DICOMImageReader" extensions="dcm"
          file_description="DICOM Files and folders">
  </Reader>
</ParaViewReaders>

How may I change the element 'extensions' ?

Thanks !

Jerome