3.0 - Project Task - Fixes and windows compatibility

Sorry for suppressing errors, I know that's not very nice, but apart from testing against the paths defined for the `open_basedir` option that seems to be the only way to avoid being flooded with errors on systems that restrict PHP filesystem acceess.
@lorenzo Are you referring to the change from `file_exists` to `is_file`, or the addition of the `@`?