Qt Creator's run settings
When you open a project, select Projects on the left sidebar and select Run settings you can see Run Environment details.
The question is - where are these settings stored? I've searched over windows' registry and projects' .user files but there is nothing related to it. And when i select "Clean environment" the PATH variable still contains paths to my projects' dependencies.
Did some investigations of Qt Creator's sources. It takes clean Run Environment from project's .pro files by searching for "-L/some/folder" records. I didn't find any reference to it in Qt Creator's manual.
The environment is not stored: It is generated by making sure all required stuff is there.
You can extend/change/override this with your own settings which are saved as a delta to the "normal" environment in the .user file. Whether the environment is the system or the clean one is stored in the same place.