Hi

> DECLARE EXTERNAL FUNCTION Distrib
>
> INTEGER, INTEGER
>
> RETURNS CSTRING(20) FREE_IT
>
> ENTRY_POINT "IB_Distrib" MODULE_NAME "ib_install_dir\distrib.dll";

Copy distrib.dll into C:\...\InterBase\Bin directory and change last line
ENTRY_POINT "IB_Distrib" MODULE_NAME "distrib.dll";