Quote Originally Posted by MarvinP View Post
Hi backdrop and welcome to the forum,

Just a guess, but old Excel used".xls" files and then along came ".xlsx" for the extension. Perhaps you installed a version of Excel that didn't recognize the newer .xlsx type of file? Check what program is supposed to run when you double click on a .xlsx.

BTW - what version of windows are you using as this might explain the behavior also.
All I did was reinstall the identical things that had been on the computer for 15 years! All my other 50 or 80 programs work exactly as they did before. Win 7. I've been using xlsx and docx files in Office 2003 for years with no problem - I installed special converters.