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read/write VI's? why so many?

Hello,

I notice that in labview, I can:

read/write to a SPREADSHEET
This requires FILE_PATH and FORMAT


I can also:
read/write to a FILE
This requires a FILE_PATH and NO format
(because it is binary data)

And, then I can read/write using a THIRD type of VI

How is THIS read/write different from the ones above?

I can see that THIS read/write requires a refnum from the
open... OK... one structural difference...
This one does not allow for formatting... but yields a BROWN data.

Now, what is this DATA... is it binary?

What is the purpose of the OPEN/read/write/Close
on the second lines of the FILE/IO vi's

Can someone describe these and how they relate to each other?

Thanks,

Tom
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