Error message trying to open .xls files using Excel 2013. "Cannot find" file if you double click the file from a Dropbox local folder which is green light synched. You can open the same file if you either copy it to the desktop or open it from the web-based dropbox. Dropbox support- please help! DDE option is unchecked in General settings in Excel. This does not change anything. Please help Dropbox support- this same bug is all over your question boards but still unanswered.