Custom refnum - what is the underlying numeric type of refnums and how do I comply with the subtype

Specific refnum I am planning using is based on the byte stream file refnum - and will be passed in and out of a DLL via code interface nodes - would it be U32 or I32 underlying type or something else?
I am basing the sub-type concept on the following online reference:
http://labviewwiki.org/Refnum
Is the above correct and how are the 8 bit values encoded into the refnum numeric type (MSB's or other?)

Steve_Mowbray wrote:
Thanks for prompt and clear response
- labview file manager functions can be used to access the file OR the file descriptor can be passed to my own custom code functions (I hope)
That last one is undocumented and may not work on all LabVIEW platforms. It is true for older 32 bit versions of LabVIEW but may change at any time at NIs discretion since they never documented that nor guaranteed that it might work that way.
Also on Windows there are several different file descriptors possible. First you have the WinAPI HANDLE, then the C runtime "int fd" and FILE datatypes. All of them are not the same, but the LabVIEW File did in the past map to the HANDLE. 

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