I threw together the following DLL , see if its what you were looking for, if not let me know and I'll see what i can do, although it would be helpful for the exact script your trying to use..

$dll(CRC.dll,crc,[color:red]filename)[/color]

Do not, include "s in the filename, these are added by the DLL.
The .DLL will also return;

$dll(CRC.dll,isconn,1) - CONNECTED/NOTCONNECTED in an attempt to check if you are connected to the Internet.

$dll(CRC.dll,version,1) - DLL Information.

Eamonn.