Hi,
Where do the Excel files be saved, locally or on a shared network drive?
Are there any other formats files saved with Excel files in the same location?
Are these Excel files encrypted?
What are the Office version number and update channel? You can get this information via File > Account > Product Information in one Office app.
We went thru that list and performed the steps
You have checked the File Types list for .xlsx and .xls, am I right? Have you tried rebuilding Index?
The excel files extensions are checked.
Have you tried following steps?
Please go to Registry Editor, navigate to the following path: HKEY_CLASSES_ROOT\.xlsx
- Make sure the value data of "Default" string is Excel.Sheet.12;
- Go to
HKEY_CLASSES_ROOT\.xlsx\PersistentHandler
, ensure the value data of "Default" string is {4887767F-7ADC-4983-B576-88FB643D6F79}.
Then locate to the following path: HKEY_CLASSES_ROOT\.xls
- Make sure the value data of "Default" string is Excel.Sheet.8.
- Go to
HKEY_CLASSES_ROOT\.xls\PersistentHandler
, ensure the value data of "Default" string is {98de59a0-d175-11cd-a7bd-00006b827d94}.
From the Office perspective, you can also perform an online repair for Office and update Office to the latest version to check this issue.
Or you can uninstall Office completely and then re-install it.
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