App to distribute extension to correct browser

I have a folder of extensions and I need somebody to create a program that will distribute the file to the correct browser. I'll provide you a folder which contains a .exe .crx .safariet and a .xpi file. I want the program to download each file to it's specific browser. For example, a user has only Google Chrome installed, so it will need to download the .crx version. No installation wizard is necessary;just do whatever it's best for you.