I use FileMaker Pro 13 Advanced. I have just upgraded to El Capitan (OS10.11). I have been using Excel with FileMaker for years. Today I opened a spreadsheet in Excel, to clean up some headings. I saved the file (xlsx). I opened in FileMaker and was presented with a long list of filters for converting. I have never encountered this before.
I was not able to open the Excel file.
I just opened the same Excel file in my Win7 computer, made the changes and saved it. My regular FileMaker 13 was able to open. I wanted to use my copy of Advance to import and make copies of tables that the Regular version cannot do.