To test as intended: see read me! file in zip This program is still under development, but feel free to make this code better with suggestions and better code  There is an open ticket for a bug in _GUICtrlRichEdit_StreamToFile so the script uses a workaround: https://www.autoitscript.com/trac/autoit/ticket/4038#ticket Wanna take a look at the code? Here you go: #cs function: minimalistic program that edits custom rtf files version: 3 made by: TheAutoma