I need to work with the Microsoft HTML Help API, which comes as hhctrl.ocx and can be used like a DLL.

To make this work, I had to change the NativeLibrary.java.

Please add the check for .oxc file extension to com.sun.jna.NativeLibrary.mapSharedLibraryName(String libName):

I replaced:

    else if (Platform.isWindows()) {
        if (libName.endsWith(".drv") || libName.endsWith(".dll") ) {
            return libName;
        }
    }

with

    else if (Platform.isWindows()) {
        if (libName.endsWith(".drv") || libName.endsWith(".dll") || libName.endsWith(".ocx")) {
            return libName;
        }
    }

and stuff works now. Please change this in your repository, many thanks.

I am using:
jna-5.2.0 on Win 10 with Oracle JDK 1.8