Microsoft has released updates that have caused some downloaded files not to open, most notably HTML with .xls extension. The updates in question are:
- Windows Update KB3115262 (Excel 2013)
- Windows Update KB3115130 (Excel 2010)
There are several options that can eliminate the problem:
Option 1
- Control Panel > Internet Options
- Security Tab > Trusted Sites
- Add the site you are downloading from to the trusted site list
** You will need to re-download excel files once this change is made. Files previously downloaded when untrusted may still open blank **
Option 2
- Go into the properties of the file you have saved to your computer (right click it, then left click properties)
- Click Unblock
- Click Apply
- Open the file
Option 3
- Open Excel Go to File Options
- Click Trust Center -> Trust Center Settings
- Go to Protected View. there are 3 options that show that were all clicked. Uncheck the first option that reads -- "Enable Protected View for files originating from the Internet"
Option 4
- Open Excel Go to File Options
- Click Trust Center -> Trust Center Settings
- Go to File Block Settings
- Uncheck Web Pages and Excel 2003 XML Spreadsheets
Option 5
- Uninstall the previously mentioned update that applies to your Office version
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