I work on a tool that shall provide a coloured log, so I want to append to a RichEdit a multiline string with a dedicated color. Already existing text in the log shall remain unchanged. To do this I use a wrapper for _GUICtrlRichEdit_AppendText which remebers textlenght before appending the new log portion, adds the new string, selects from the old position till the end of the richedit and then coloures the selection. Here a small dummy #include <GuiRichEdit_org.au3> #include <G