1) Use Windows Explorer to locate the encrypted file that you want to decryption.
2) Right-click the encrypted file, and then click Properties.
3) On the General tab, click Advanced.
4) Click to clear the Encrypt contents to secure data check box, click OK, and then click OK again.
If you want to decrypt only the folder, click Apply the changes to this folder only, and then click OK.
If you want to decrypt the folder and its subfolders and files, click Apply changes to this folder, subfolders and files, and then click OK.