where do i get .def(LIBRARY RILGSM, RIL)for rilgsm.dll, ril?

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Hi all,
I am trying to write my own API's for communication between pocketPC and SIM.
Can any one please guide me where to find ril.dll and rilgsm.dll relateds and how to open these library.
I have gone through the mesasge posted(Posted:Sat Feb 01, 2003 23:50) by 'W4XY' on .def's, can you please tell me how did u got this? do we get definition of these function prototypes? such as:RIL_SendSimCmd @ 93 ;
RIL_SendSimToolkitCmdResponse @ 100 ;
RIL_SendSimToolkitEnvelopeCmd @ 98 ; etc.
please help me
Thanks and regards
Hema