Removing false indication of a macro

Somhow I created the indication of a macro in a workbook. I cannot recreate how I caused the problem, but it may have started when I accidentally looked into the specifics of a page layout or format details. Now each time I open the file, I get prompted "The workbook you are opening contains macros...[Disable] [Enable] or [Do Not Open]". I would like to remove whatever is causing this prompt, but I cannot locate anything. There are no macros listed in the workbook. The file is rather large: 99 columns, 6000+ rows, 55 worksheets. If it were a smaller file, I would cut and paste to a new file to remove the problem. I would appreciate any ideas for solutions.