You can add your own SSI aliases or, in other words, specify SSI file name extensions. For example, you can specify that all *.ssi files must be treated as server side includes.
To add an SSI alias, do the following:
In the window that appears, enter your SSI file extension beginning with a dot:
Skip this step if you are using a Windows-based plan.
At the top of the Web Service page, click the Apply link for the Server configuration to change. The changes will take effect within 15 minutes.
Skip this step if you are using a Windows-based plan.
At the top of the Web Service page, click the Apply link for the Server configuration to change. The changes will take effect within 15 minutes.