I am developing i a c-editor which can run graphics on VISTA and can use minimum system RAM and processes. I need C help file database wich can be linked to my software

Google search for ODBC, which is the oldest and most widely used way to access databases from almost any programming language. You will also find ODBC tutorials in C language. It would be a little easier to do it in C++, but that's beside the point since you specifically want C language.

>I need C help file database wich can be linked to my software
???
It's interesting: I have never seen such animals before...

May be you want embedded database engine?
That's it:
http://www.sqlite.org

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