Yes, you are right; there are problems with using the ndisapi.dll binary included within the WinplFilter package. The problem was caused by moving the NDISAPI project from one building environment to another so the routines exported through the DEF file were not exported anymore (this binary also is not possible to use with Delphi). We appreciate you report, WinpkFilter packages with fixed ndisapi.dll binary will be available for download in the next few days.
Fixed binary also available for download from the following link http://www.ntkernel.com/downloads/ndisapi.zip
Since WinpkFilter 3.0 we provide the complete source code for the ndisapi.dll in the freely available packages because of different building environments you may have to use. So, you can modify/port/rebuild the ndisapi.dll or even integrate it into your application.
Some others functions doesnt respect the functions declarations presented in the Help.
Could you please provide the details?