This plugin is for browser that can open the wrl file. Install for the browser already in Ur pc (for windows XP and Vista).
After finished, Setting the VRML file association (mimetype) for the web browser is not required, but
after installing Cosmo Player in the web browser, opening a local .wrl file might not start up the web browser. If so, then:
Double-click the 'My Documents' icon on the Desktop.
Go to 'Tools' > 'Folder Options...'
Go to the 'File Types' tab and scroll down to the 'WRL' extension and the 'WRL File' file type.
Under Details for 'WRL' extension, it should indicate 'Opens with: Firefox' (or Opera, Safari, Google Chrome, etc.)
If not, click on the 'Change...' button and from the list of programs, select
Firefox (or Opera, Safari, Google Chrome, etc.) and check the box 'Always use the selected
program to open this kind of file'.