Should a desktop app open by default in fullscreen mode?

I'm currently building a multi platform desktop app. Should the app open by default in fullscreen mode?

Answer

No, a desktop app should remember the way it was set last time it was used - size, position and mode (minimized, maximized, normal) - and open in exactly the same way.

Please note that minimizing and maximizing a window changes its size and possibly its position settings, so to achieve this a desktop app should remember the size and position values when it gets minimized or maximized. Otherwise the "normal" size and position values will be overwritten with the minimized/maximized values.