I can only warn you to create file context menu entries with icons in this way.
I did this too some time ago and noticed some curious behaviour of MP3Tag while using the context menu and a file selection.
So I a started a bug-thread in the german bug-section.
https://community.mp3tag.de/t/af-explorer-kontextmenu-dateienauswahl/19768
For those with no knowledge of german language and no knowledge how to use an online tramslater:
Subsequent use of the context-menu with different file-selections shows erroneous behaviour.
Sometimes less files than in the selection are delivered to MP3Tag, sometimes even more.
In the meantime I traced this behaviour to the self-created context-menu-entry. Restoring the orignal context-menu of MP3Tag fixes the error.