If you want to protect your Excel files from the eyes of others, you can actually password protect it in Workbook level. With this password protection, when you open the Excel file, Excel will ask you first for a password before you can view the contents of the workbook.
To password protect your Excel workbook, follow these steps:
1) Go to Save As then click the General Options from the Tools options.
2) At the General Options, enter the password key at the Password to open and modify. Make sure to remember your password else you need an Excel password unlocker.
This Excel trick will be applicable to Excel 2007 and higher versions.
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