Thanks, any suggestions? I have also tried Long with the same result.
Declare Function gen_rand32 Lib "C:\Users\Neil\Documents\Visual Studio 2010\Projects\SFMT\Release\SFMT.dll" () As Long
Declare Sub init_gen_rand Lib "C:\Users\Neil\Documents\Visual Studio 2010\Projects\SFMT\Release\SFMT.dll" (seed As Long)