You might want to prevent the encryption of files in a certain folder to ensure that they remain available to everyone who has access to the folder. To disable encryption within a folder, use Notepad (or another text editor) to create a file that contains the following lines:
Save the file as Desktop.ini in the folder in which you want to prevent encryption. Any encrypted files already in the folder remain encrypted, but users who attempt to encrypt any other files will be stopped with this message: “The directory has been disabled for encryption.”
Disabling encryption in this fashion doesn’t disable encryption altogether, even within the folder you’ve set up. If you copy or move encrypted files into the folder, they remain encrypted. And if you create a subfolder within the folder, you can encrypt the subfolder and any files it contains.
Files still become encrypted after you’ve disabled EFS for a folder
You might discover that files added to a folder become encrypted even after you create the Desktop.ini file described here and store it in the folder. This can occur if encryption was already enabled for the folder when you added the Desktop.ini file. (With the file in place,you won’t be able to set the encryption attribute for the folder.) To prevent new files frombeing encrypted, right-click the folder, choose Properties, click Advanced, and clear the Encrypt Contents To Secure Data check box.