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What should I do if I encounter the error "this excel file format is different than file extension" when opening an Excel file on a network share?

Release date: 2023-09-20

Applicable Products:

All NAS series

Root Cause

You may encounter this issue when trying to open Excel files via an SMB connection to the NAS. This is a known issue caused by security update for Excel 2013 (KB5002242).

Solution

Install update for Excel 2013 (KB5002268).

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