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msg file doesn't open in Firefox

Last Modified: 2012-12-09

I have a web page from which I open files stored in SQL. To open them I use a IHttpHandler with this code:

                context.Response.ContentType = "application/vnd.ms-outlook";
                context.Response.AddHeader("content-disposition", "attachment;filename=" + docName);

This works fine to open msg files in Internet Explorer but when I use Firefox I get the following message:

The command line argument is not valid. Verify the switch you are using.

Any idea how to fix this?

Best regards
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