Extensible OCR engine for .Net

I'm looking for free (or free to try) OCR engine for .net which is extensible (I want to add not supported language(s)). I know some OCR engines, but I need a suggestion. Which is better and extensible?

Thank you!

What languages do you want to add? ABBYY OCR engine supports 198 languages for OCR and 113 for ICR and it's way much better that its competitors. It's free to try, trial version can be requested here. I work @ ABBYY and can provide you some more details on our engines if necessary.