A better solution that actually encrypts your data is Cryptomator. Been using it for years, it's free and open source too.

Not safe

If the folder was on drive C: , it was moved and only a file .pff remains at the source.
Was ist on another drive, the folder remains there, but get a name like PFDocument...

BE CAREFUL:
in both cases the files are not encrypted at all ! - only the new folder name is replaced through one, which won´t be accepted by most programs !

- "IrfanView" es (as wll as other tools) CAN read in files from such folders (if you find access)
- the "TotalCommander" (as well as other tools) can easily rename such : after renaming them, ALL files can be seen and used BY ALL PROGRAMS again.

I would not call that safe (took me less than a minute to find that out...)

On my system it only changes the name of a folder, nothing more, nothing less. No protection at all.

czy linux moze to odczytać ?

I like protection with a vault, you can put 1000's of other folders or individual files that can not be accessed, except by the person with the password. You can copy, backup, move and resize the vault as you wish. The encrypted vault is much much secure than the individual files and can be installed on a USB disk and you only need one password to access the huge numbers of the folders or files inside. (just keep your password written somewhere on a piece of paper, just in case only)

What I don't like with the Password Folder protection approach is the following: suppose you have a folder, let's call it secretfolder, containing files secret1.txt, secret2.txt etc. After protecting it with Password Folder all data are stored in file secretfolder.pff. Now if you want to read the content of secret1.txt, you first have to convert file secretfolder.pff back into folder secretfolder in order to be able to read it. During this time it's unprotected and everyone can read it. And if you forget to protect it again, it remains unprotected.
A better approach is using the free 7-zip and convert folder secretfolder into a password protected file secretfolder.7z. With 7-zip you can then read secret1.txt without having to convert file secretfolder.7z into the unprotected folder secretfolder.

As well as protecting against viruses, hackers, and all the other little cyber cooties out there, Norton has this, and assists with automatically logging them onto sites you use frequently if you desire.

One of the things I like best about GAOTD are the comments sharing alternatives.
Below is the title of an article just out this morning on MSN that offers a script to lock a folder,
as well as listing several alternative programs and methods.
Personally I prefer a lockable thumb drive. Cheers.
How to Password Protect a Folder in Windows

Question for the developer: If I apply a strong password is this enough to protect from ransomware? Thanks.

The biggest drawback is that it only helps against your mother.

It is so unsafe that "protection" can easily be removed with a single line (on the commandline).

My advise: Use for public data only!

I think the biggest drawback of this software is that once you password protect a folder you cannot copy it to another drive without decrypting it.

If you're password protecting a folder, obviously that means the folder contains important files. So, after password protecting a folder, it will remain only on my hard drive. What happens if my hard drive fails? I will lose this important data because I am unable to take a backup!

You may argue that I could decrypt the folder and then take a backup. But that would be a nuisance if the contents of the folder keep changing, because then I would need to periodically decrypt the folder to take a backup and then encrypt the folder again and also encrypt it on the backup disk too!

I like the idea of encrypting a folder, but I feel the program would be better if one could copy the encrypted folder to the backup drive or a cloud drive.