Capitalized File Extension???? Why and How to Change from ".XLSX" to ".xlsx"

AlexB123

Board Regular
Joined
Dec 19, 2014
Messages
194
I have an excel file that is saved with a capitalized extension, "XLSX". I've tried to resave the file with a lowercase "xlsx" extension, but I am unable to do so. I've checked in the options and settings, and searched online for an explanation, but have had no luck.

Can anyone tell me when and why files get saved with a capitalized extension? Also, how can I change to the lowercase extension?

Thanks,
 

jmacleary

Well-known Member
Joined
Oct 5, 2015
Messages
779
Office Version
2007
Platform
Windows
Hi there. I assume you are using windows, which for largely historical reasons doesnt differentiate between upper and lower case all the time. So, instead of using save as, use file explorer to edit the extension directly. The cahnge will then stick. You may need to change your view setting to show file extensions.
 

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