Changing all my files

I need to change every file extension from HTML to ASPX now, Google has already indexed my entire sites html files.

So when people in google will click on my links they will be 404'd until the next object.

Is there anything I should know, could I get penelized?

My site is new so I dont get much SE traffic yet, so im not worried about loosing traffic.


Any advice? I don't have a access htm file; have to make them an aspx script because google indexed my whole site with canonicalized urls. (www and non www)

 

dont change anything, you can simple add a entry to the httpd file to interpret html files as aspx if you host supports that

or with htaccess

AddType x-httpd-php .php .htm .htm

 

You can also keep existing file if you want and do a redirect through htaccess.