Used File Shield for Windows?
Developer’s Description
FileShield lets you protect a file and share it without having to share the application you used to protect the file. Using FileShield, you can protect any kind of file, FileShield protects it with a password and produces an executable file. All you have to do for sharing is to share this executable and the password. On execution, a password is requested, if correctly entered, the protected file is extracted and executed! Even if changes are made to this file, the encrypted file remains the same for every execution.
You can distribute files and protect your credits from being modified, the contents of the protected executable can never, ever, be changed. If changes are to be made, a new executable has to be made using the parent application. This version is the first release on CNET Download.com.
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