The Windows implementation of url_launcher.
The plugin has reached a stable API, we guarantee that version 1.0.0 will be backward compatible with 0.0.y+z. If you use url_launcher_windows directly, rather than as an implementation detail of url_launcher, please use url_launcher_windows: '>=0.0.y+x <2.0.0' as your dependency constraint to allow a smoother ecosystem migration. For more details see: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
This package has not yet been endorsed. Once it is you only need to add url_launcher as a dependency in your pubspec.yaml, but for now you need to include both url_launcher and url_launcher_windows.
This is what the above means to your pubspec.yaml:
... dependencies: ... url_launcher: ^5.5.3 url_launcher_windows: ^0.0.1 ...