This short article shows you how to resolve the error “This workbook contains links to one or more external sources that could be unsafe.” keep popping up when you are opening the Excel workbook.
You might have the problem below when you are opening your workbook.
There is a file you will find findlink.xla.
Open the file with the error. Go to File -> Add-Ins. Under the Manage: choose Excel Add-ins then click Go.
Browse to your findlink.xla then click OK.
Well, up to this point you will be panic like I do. I could not find anything in my Spreadsheet Ribbon after I select the add-ins.
What I did, do not close the Excel spreadsheet but double click on the findlink.xla file. This is how it looks.
Now you can find your broken links.