On that note to developer: I'm using Winrar 6.02 x64 and I created Winrar archive package on desktop. Rightclicking it and choosing "Open with WinRAR" - no problems with icons.
Meaning it can be fixed.
When the program is started from the context menu, there is no icon on the taskbar. When launched from the shortcut, everything is ok.
Windows 11 Pro 22000.265, no tweaked
Mp3tag 3.14 d, e, f [x32, x64], standard installation
The workaround I've implemented for Windows Explorer tries to execute Mp3tag using the Explorer instance. This prevents the Mp3tag.exe from being started with the identity of the DLL which results in no icon being shown on the taskbar.
The Mp3tag Shell Extension implements IObjectWithSite and queries the provided site for a series of COM interfaces to finally call IShellDispatch2::ShellExecute. It's quite a ride and it seems that this sequence of COM interfaces is not provided by Total Commander.
I'm marking this as #bug-fixed as it's now working for Windows File Explorer and TC's behavior is beyond my powers.
Yes, after updating to 3.15, the context menu appeared in TC, but then disappeared. Haven't had time to analyze if it's related to the release of 3.16.
Apparently I am not the only one: https://community.mp3tag.de/t/no-explorer-context-menu-integration/13891/26?u=imagine
Completely uninstalling 3.16 and a clean installation of 3.15 had no results.
While I am still in the research stage, will have any results, I will report.