Sets the .manifest file to use as your application manifest (/win32manifest). An unqualified file name means the .manfiest ...

Sets the .manifest file to use as your application manifest (/win32manifest). An unqualified file name means the .manfiest file is located in the project directory (location of .csproj file). Relative paths are recommended when the project will be opened on more than one machine.  The path should be relative to the project directory.