This download is a poorly written (I don't know C# at all) DLL file that exposes Søren's ability to Import From / Export To text files directly to NAV via Automation.
This would absolutely not be possible but for the wonderful work of Søren Nielsen, provided freely to the community on his blog, http://www.gotcal.com.
See the included example FOB for usage. Very bare-bones, but anyone who wants this can certainly make use of it.
To make use of this DLL (which is a .NET DLL), you'll have to use the included installation batch file, which relies on 'regasm' from the v2.0.050727 .NET Framework, typically located in C:\Windows\Microsoft.NET\Framework. You *must* run this in the same directory as the NAV Client or you'll get errors when attempting to use.