0.99.1: In "Icons," "List," or "Details" view, images may launch in the wrong app

[Fleet Command]

XnView: MP 0.99.1 - 64 bit
OS: Windows 10 v21H2, Windows Server 2022

XnViewMP's browser may or may not work properly when:

1. The browse mode is set to one of the following views: Icons, List, or Details
2. The browse mode is told not to scan file headers

When these conditions meet, XnViewMP doesn't properly highlight image files. Double-clicking on the image files results in XnViewMP launching the app with which the file is associated instead of its viewer mode.

Effect: Critical functionality impairment; the app doesn't perform the one thing it is meant to do: showing images!

To reproduce:

1. Prepare a test machine (or virtual machine) with the following conditions:
   • Install Microsoft Windows
   • Copy several images (JPEG, PNG, and WebP) to the test machine
   • Make sure an image viewer other than XnView MP is installed. (e.g., ImageGlass, Irfan View, or Microsoft Photos)
2. Install XnViewMP 0.99.1
3. Run XnViewMP 0.99.1
4. Confirm the defaults for the first run.
5. From the menu bar, choose Tools → Settings. (Or, just press F12 on your keyboard.)

   

6. From the menu bar, choose View → View as → Details

   

7. Exit XnView MP!
8. Start XnView MP again.

Actual behavior (bug): XnView MP shows a list of images with a gray background, indicating that it has not detected their type correctly. Double-clicking on the image launches the associated app (the same effect as pressing F3.)

Expected behavior: XnView MP must be showing a list of your images, highlighting each file according to its type. For example, JPEG images must appear with a light yellow highlight. Double-clicking on these images must take you to the Viewer mode.

[xnview]

yes right an issue. If scan headers is disabled, XnView don't know if it's a picture file