Windows Yes/No

In the ftn95p file, what does the 'Windows' entry do? In my file this can be 'Yes' or 'No', but I do not know how it is set.

It is the linker option for a 'Windows application'.

'Yes' is the same as using the directive WINAPP and creates a 'Windows' application as opposed to a 'Console' application.

Basically it sets the appropiate flag in the PE header of the application.