Managed Pipeline Mode

Hi, 

I am new to this forum. I need a help.

I am using IIS 7.5. My website uses Classic pipeline mode. Now; I added custom fonts (*.woff); but it won't load. Instead it shows me 500 Internal Server Error: Failed to execute url.

When I used Integrated pipeline mode; it works completely fine. But I must use Classic mode for this.

Please somebody help me out of this. I am banging my head since 3 weeks only for this.

Thanks !

Bikash