I have been updating my blog to include demo versions of the pages. A number of my blog entries include the use of css3pie which uses a file called PIE.htc to render css3 content in IE. Having stuck the demo pages on Effective Web Designs, I discovered that PIE.htc was not delivering the goods as it normally does.
After a bit of surfing, I found that it may be to do with not serving the .htc mime type. After a bit more surfing, I discovered that this could be achieved by setting the mime type within your .htaccess file, if you are using the only web server which matters (Apache).
This is the line you need for your .htaccess file.
AddType text/x-component .htc
I hope this also opens up all sorts of mime type possibilities to you.