I have an applet program using JNI. I made cab file that contains my dll and class files using cabarc tool. When a client connects to my web site, my cab file is downloaded on his computer. but it's not enough.

Davanum Srinivas

Here's a sample from Microsoft that installs Native DLL's onto a client machine.

SAMPLE: InstlDLL.exe Installs Applet and Native DLL Onto a Client Machine