%LOCALAPPDATA%\Microsoft\Office\v.v\PowerQuery\Users.zip

This zip file seems to store data source related «query permissions» etc. It contains the following files:

• Firewall.xml
• [Content_Types]
• Credentials\Credentials.bin (apparently encrypted using the Data Protection API)
• NativeQueries\NativeQueries.xml
• QueryPermissions\QueryPermissions.xml
• UserCorrelation\UserCorrelationID.xml
• UserInterface\Settings.xml