HEIDENHAIN iTNC 530 (340 49x-03) smarT.NC Pilot - Manual (Page 8)

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File management with smarT.NC
As mentioned previously, smarT.NC differentiates between three file
types: unit programs (.HU), contour descriptions (.HC) and point tables
(.HP). These three file types can be selected and edited in the file
manager in the smarT.NC operating mode. Contour descriptions and
point tables can also be edited if you are currently defining a working unit.
You can also open DXF files from within smarT.NC in order to extract
contour descriptions (.HC files) and machining positions (.HP files) from
them (software option).
The file manager in smarT.NC can also be fully operated with the mouse.
You can even use the mouse to change the sizes of the windows within
the file manager. Click the horizontal or vertical separating line, and drag
it to the desired position with the mouse.