is most often used by the end user.
\item The \helpref{wxFileSystemHandler}{wxfilesystemhandler} is the core
of virtual file systems mechanism. You can derive your own handler and pass it to
-of the VFS mechanism. You can derive your own handler and pass it to
+the VFS mechanism. You can derive your own handler and pass it to
wxFileSystem's AddHandler() method. In the new handler you only need to
override the OpenFile() and CanOpen() methods.
\end{itemize}