From the Apollo Release Notes:
In order for client browsers to recognize an Apollo application when being downloded, the Web Server hosting the Apollo applications needs to map the following mimetype
to the Apollo extension ".air". For example, for an Apache Web Server you will add to the AddType section:
AddType application/vnd.adobe.apollo-application-installer-package+zip .air
Note, you can do this in the web server config, or if using Apache, in the .htaccess file.
Update (8/26/08) : The mime type changed for the AIR 1.0 release.
The correct MIME type for an AIR file is:
For example, to set the MIME type for the Apache server, you would add the following line to your Apache configuration file: