SecretFolder is mentioned in best tools to protect your folders with a password
SecretFolder 7.5.0 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free PC program is compatible with Windows XP/Vista/7/8/10/11 environment, 32-bit version.
The SecretFolder installer is commonly called SecretFolder.exe. This free program is an intellectual property of ohsoft.net. SecretFolder relates to Security Tools. The following versions: 7.0, 6.8 and 6.6 are the most frequently downloaded ones by the program users. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
SecretFolder can hide your data from viruses, malware, ransomware, and from other users of your computer. It provides a simple interface where you can drag and drop the folder you need to protect. These folders cannot be accessed from any other application, including commandline. Data can only be accessed by unlocking the folder with your password through SecretFolder.
You may want to check out more software, such as MySecretFolder, which might be related to SecretFolder.