Like stated in the documentation:
code:
Example 2
ScriptInfo file used to create a Script Pack. During import, the "ExtraFuncVB.dll" ActiveX will be registered with resvr32.
<DotNetFiles>
<FileName>ExtraFuncVB.dll</FileName>
</DotNetFiles>
So, you just change ExtraFuncVB.dll to Xniff.ocx and voila'