[BUG] ITaskbarListX and isolated processes

[fixer]

Some methods of ITaskbarListX COM-interfaces (like SetOverlayIcon) may not work if called from isolated processes. The reason behind this is that they communicate with explorer.exe process for it to do all the heavy lifting (for example update application icon in taskbar). And to do this they try to open explorer.exe process. And because the process is isolated it fails to do that with access denied error.