Hi,
There's no difference in transfering a file than a regular write operation. In both cases you are sending a stream of bytes. In LabVIEW, you just need to open a file and use the GPIB (or VISA) write VI. If your programming in C, you can call the NI-488.2 function "ibwrtf". This function automatically opens the file and writes the data in the GPIB bus.
If you are trying to figure out the format of the file, you'll have to check the instrument's documentation. The NI-488.2 driver allows to send bytes to the instruments. The way does bytes are interpreted depends on the instrument. When sending a file, the driver will read each byte and send it through the GPIB bus. The driver treats every file as a sequence of bytes.
Hope this helps out.
Diego F.
National Intruments
