When a worksheet is hidden using `xlSheetVeryHidden`, it cannot be made visible again through the Excel user interface, adding an additional layer of protection to your sensitive data.

Protecting a worksheet in Excel 2003 prevents others users from editing it. For example, if you have tracked and charted your business's sales on a sheet, you will want co-workers to access the ...

Open the Excel file you want to protect with a password. Click on File -> Info. Now select Protect Workbook. Select Encrypt with Password from the list. Now enter the password. Confirm it once ...

You can use Excel to control access to the PDF and prevent unwanted changes to your worksheet. You can also lock specified cells to protect the worksheet.

Crisis averted–kind of. Permission to copy the entire workbook is another problem. For instance, if you open a protected Excel file in the browser edition, you can see hidden formulas.

I'm going to hazard a guess that it was being saved in compatibility mode in the original excel format. Somebody "updated" it, and the password protect would have died with it. You'll either need ...