I have a collada file in my project with extension .dae In IIS 7 I set MIME type: model/vnd.collada+xml for .dae extension. I also set anonymous authentication to true. Now I have some problems displaying this collada model. Some user are not able to display model. What is quite interesting they are not able to display it in mozilla, but in explorer they don’t have those problems. Others are not able to display it in Explorer, so there is no dependence. What might be the reason?