This document discusses using AppVeyor for continuous integration of Windows projects. It provides examples of setting up AppVeyor for the Vim text editor project and the vimproc.vim plugin. Some problems encountered include configure failures on Cygwin and MSYS2 due to redirection issues, and Vim not working at all on Cygwin/MSYS2 without any errors or output. Help is requested to resolve the Vim issue on those platforms.