MP3Tag dooes not have an option to write ID3v2.4 ISO-8859-1. So you probably mean ID3v2.3 ISO-8859.
As Ohrenkino already wrote the windows-explorer could not handle ID3v2.4-Tags.
But at least since the Windows 10 Creators update in spring the explorer is able to show those tags.
There is a thread in the German part of this forum about this feature:
Kann Windows 10 endlich id3v2.4 Tags lesen?
I never use the preview pane for MP3s in Windows but I just tested it with the latest Windows 10 (Fall Creators Update) and cover images in ID3v2.4-tags are displayed.