Tha'ts a Windows Sharepoint Services RPC call,

This is the URL Protocol

http://sitecollectionurl/subweb/_vti_bin/owssvr.dll?CS=109&Using=_layouts/query.iqy&
List=ListName&View=ViewName

I'm trying to send CAML Query, using POST command...

If you have to export a custom list items interval, you can use a "temporary" SPView,

create a custom List View using Windows Sharepoint Object Model,then export on Excel using the URL Protocol 

Windows Sharepoint Services RPC Reference

http://msdn2.microsoft.com/en-us/library/ms448359.aspx

See you next!!