How to map a custom file extension to mono?

Question

I have mapped *.xyz extension to my own custom handler in asp.net and can run it on Windows asp.net.

How can I do the same thing on mono (Linux/Apache - ubuntu)?

I have this in my web.config: <httpHandlers><add path=".xyz" verb="" type="MyCustomHandler,..."/>... I also added similar things to mod_mono.conf and several other files but still I get http 404 The resource cannot be found.