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Excel cannot open file because file format or extension is not valid

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.
TWCN Tech News1d

How to open CFG files on Windows PC

Files with a CFG or a CONFIG extension are used to modify the configurations and parameters of computer programs. Free tools to open them!
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I Finally Tried This Excel Feature Everyone Knows But Ignores—It's Much More Useful Than I Thought

I ’ve always used Excel for quick calculations and simple tables. But aside from common formulas and basic data manipulation ...
XDA Developers on MSN4d

I use these open-source apps to make my life complete

Discover the power of open-source software with these 7 essential apps that have revolutionized my productivity, creativity, and digital well-being.

Here are all the new features Microsoft added to Excel in August 2025Here are all the new features Microsoft added to Excel in August 2025Here are all the new features ...

Microsoft added a bunch of useful capabilities to Excel this month, including one that was highly requested by customers.
Scientific Research Publishing23h

Assessing the Magnitude of Household Water Demand in Makeni City Ward 121: Implications for Urban Water Resource Management in Sierra Leone ()

Demand, Water, Demand, Ward 121, Makeni City, Sierra Leone Share and Cite: Iortyom, E. and Kargbo, M. (2025) Assessing the Magnitude of Household Water Demand in Makeni City Ward 121: Implications for ...