Copying .dll files into the windows folder

Hi all,

now that I'm using more and more additional dll's with mit programs and I don't want them to be more than once on my device, I followed a hint from the old forum to copy them into windows folder.
But this doesn't work on my WM5 device. Every application gets an error due to the missing dll's. Where do I get wrong?

specci48

It will not work, you must save the dll files in the same folder of the source code.