+wxBitmapType wxDetermineImageType(const wxString& filename);
+
+// Convert a colour to a 6-digit hex string
+wxString wxColourToHexString(const wxColour& col);
+
+// Convert 6-digit hex string to a colour
+wxColour wxHexStringToColour(const wxString& hex);
+
+// Find the absolute path where this application has been run from.
+wxString wxFindAppPath(const wxString& argv0, const wxString& cwd, const wxString& appVariableName);