HEIDENHAIN iTNC 530 (340 49x-02) Pilot - Manual (Page 10)

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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 description (.HC files) from them (software option).
In the current software version, smarT.NC automatically
saves all files in the TNC:\smarTNC directory only.