IE only supports CUR and ANI as CSS formats for changing the cursor.
{ cursor: url('/cursors/customMoveCursor.png'), url('/cursors/customMoveCursor.cur'), move; }
Take a look here . or a good link here
You tried to edit CSS for TinyMCE as (tinymce / skins / lightgray / skin.min.css)
add what you need. Example:
.mce-grid td.mce-grid-cell div[disabled] { cursor:not-allowed }
I still recommend using the .cur file for IE.
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