"Excel AddIn to remove all custom styles
See the following KB article for more information on removing styles to avoid the Too many different cell formats alert.
You receive a "Too many different cell formats" error message in Excel
Last edited Feb 17, 2012 at 2:48 PM by AKeeler, version 4"This a drastic but maybe useful tool for removing styles from all XLS and related types of Excel format files. Maybe invoking it will get a spreadsheet that won't open to open.