How to download unity3d file from local machine

I have a web player build,that generates test.html and test.unity3d then I copy this files on a web server.
In the test.html file the script read the test.unity3d who is in the web server like test.html too.
My question is, how i can read this file from my local machine and not from the web server. I want to do this because the download of the test.unity3d is too slow

It could be that you can get the browser to cache it for you by manipulating headers. Check this thread:

The thing you ought to consider is slimming down the size of your project and load things on demand rather than all in one go if that’s practicable.