msvcp80.dll and msvcr80.dll are needed if you want to run an executable by somebody compiling with Visual Studio 2005. I did not have these two libraries and Google didn't direct me the right way either. Thomas Schweitzer — the author of UniversalIndentGUI — knew where to find them: These two files can be found inside the Microsoft Visual C++ 2005 Redistributable Package which — if not already installed — requires the Windows Installer 3.x Redistributable to run its installer.