RxFuncAdd

Another thing to remember is that some DLLs (for example RxFtp.DLL, 
RxSock.DLL) only export a general routine to register all other functions 
from the DLL (e.g. FtpLoadFuncs, SockLoadFuncs). In this case you can not 
register functions from the DLL manually. 

You may use a tool like ExeHdr to determine what functions are exported by 
a DLL.