Putting a password on a particular folder can be done with encryption soft wares like Veracrypt, AxCrypte, Bitlocker , 7 zip and more. Some of these software are free while others are premium . Let us get a simple way to do it with WinRAR.
Requirements
Winrar
A folder containing a file
Step 1
Right click on folder and select ‘’compress and email
Step 2
On the tab displayed, click on ‘’Advanced’’
Step3

Step4
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After encryption |
Note: If you are not good in keeping passwords, save a copy of the folder somewhere
The original folder will still be available with the compressed/encrypted folder. If you want to keep the encrypted folder, delete the uncompressed folder .
This type of encryption can easily be by passed. For better encryption get encryption soft wares