@Kaylee: the QFileDialog's convenient classes I'm using here make use of the platform's native dialogs when possible, but I think I could change that to use only Qt built-in dialogs. They are, however, not what every user might expect... will see.
@Anna: wow, thanks! But adding the icon resource
correctly means to do it platform-independently

, which is a bit more work... I'll do that tomorrow. For now I'll just add it to the source tree and activate it in the application window itself (run-time).
PS: could I get the icon in 64x64, please? 256x256 would be even better...