This post helps you solve 'Excel cannot open the file 'xxxxx.xlsx' because the file format or file extension is not valid.' issue.
Here's a quick and simple guide on how to convert cross table to flat list in Excel.
If Excel keeps crashing on your computer, you're no doubt very frustrated. Don't worry! Check the fixes here to learn how to solve this problem.
Your Excel file is corrupted? Don't worry. It's repair-able and you can repair it very easily. Check the tips here and you'll know how.
Trying to use the arrow keys to move the cells only to get the WHOLE worksheet jumping instead? But the good news is, it's only a few tabs/clicks away to get rid of this annoying scroll lock feature!
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