There are a few different ways that you can protect an entire folder of workbooks in Excel. One way is to use a password-protected zip file. Another way is to use a third-party software program that offers folder protection. And yet another way is to use Microsoft's built-in security features.
If you have a lot of workbooks that you need to protect, one option is to put them all into a password-protected zip file. This way, you only have to remember one password instead of multiple passwords for each individual workbook.
To create a password-protected zip file in Windows, first select all of the workbooks that you want to include in the zip file. Then, right-click on them and select "Send To > Compressed (zipped) Folder". This will create a new zip file with all of your selected workbooks inside.
Next, open the newly created zip file and click on "File > Add a Password". Enter and confirm your desired password, then click "OK". Your zip file is now password-protected.
Another option for protecting an entire folder of workbooks is to use third-party software that offers folder protection. One example of such software is Folder Lock, which allows you to lock and encrypt files and folders on your computer with a password.
To use Folder Lock, first download and install the software on your computer. Then, launch the program and click on "Lock Folders". Select the folder that contains your workbooks, then click on "Lock this Folder". Enter and confirm your desired password, then click "OK". Your workbooks are now protected with a password.
If you're using Microsoft Office 365 or Excel 2016, you can take advantage of Microsoft's built-in security features to protect your workbooks. To do this, open the folder that contains your workbooks in File Explorer. Right-click on the folder and select "Properties".
In the Properties window, go to the "General" tab and click on the "Advanced" button. In the Advanced Attributes dialog box, select the "Encrypt contents to secure data" checkbox and click "OK".
Enter and confirm your desired password, then click "OK" again. Your workbooks are now encrypted and can only be opened with the correct password.