Question about unexpected 16:9 thumbnails shown in Meta Air Link (Steam app, Unity)

Hello,

I am trying to identify the source file or mechanism used for the thumbnails displayed in Meta Quest Air Link, as I am seeing unintended images.

Issue description

When I start Air Link on Meta Quest and open Steam on the PC, the following thumbnails are displayed:

• The thumbnail shown when Steam appears in Air Link
• The 16:9 thumbnails shown in the Library / Apps view after launch

In both cases, the thumbnails displayed are not the images I expect.

Application setup

• The application is launched from Steam on the PC
• Rendering is done via Air Link
• The application is not registered as a Meta (Oculus) app
• The application is not registered via OpenVR / SteamVR .vrmanifest
• The application is developed using Unity

What I want to understand

I am not trying to customize the thumbnail at this stage.

I want to accurately identify where these thumbnails are coming from.

Specifically:

1. Which file or resource is used as the source of the thumbnail shown in Air Link?
   • Executable icon
   • Windows window thumbnail (DWM)
   • Steam library image
   • Meta Quest Link internal cache
   • Other mechanism
2. Are the thumbnails generated dynamically from a running window, or loaded from a static image file?
3. Is there any documentation describing how Air Link selects these thumbnails for Steam-launched applications?

Any clarification on how Air Link determines and displays these thumbnails would be greatly appreciated.

Thank you for your time.