I am updating Qt often and when I open a project file in the explorer, an old version of Qt Creator is launching instead of the most recent one.
I had try to update the open link, by forcing the application choice by using "open with" and check the "always use this program for this extension file" without any change.

It's maybe a good idea to add a version number in the pro file to tell which Qt Creator version need to be use and combine it with a version selector like Visual Studio do.