If you have to very often have to face files having password security… but the sad situation is most of the time you don’t have the password ready… In such a situation might the below mentioned application can help you a lot.

The application called the  Passware Password Recovery Kit Enterprise which claims to recover all kinds of passwords for the world’s most popular office application files, including Excel, Word, Windows XP/2000/NT/Vista, QuickBooks, Access, FileMaker, Outlook, Outlook Express, Exchange, WinZip, PKZip, ZIP, WinRAR, Network Connections, SQL, BestCrypt, OneNote, PowerPoint, VBA Visual Basic modules, 1-2-3, Internet Explorer, EFS – Encrypted File System, Acrobat, Quicken, Lotus 1-2-3, Lotus Notes, Lotus Organizer, Lotus WordPro, Quattro Pro, Backup, Project, MYOB, Paradox, ACT!, Mail, Schedule+, Money, WordPerfect, WordPro and more. So my opinion is that none of any extension left which it cannot handle.

Key Features
• Recovers passwords for 180+ file types and decrypts hard disks providing an all-in-one user interface
• Scans computers for password-protected files (Encryption Analyzer included)
• Supports Distributed Password Recovery
• Includes 1-year Subscription to updates

General Features
• Instantly recovers many password types
• Instantly decrypts MS Word and Excel files up to version 2003 (5 Credits for Decryptum attack included)
• Resets passwords for Local and Domain Windows Administrators instantly
• Recovers encryption keys for hard drives protected with BitLocker in minutes
• Decrypts TrueCrypt volumes in minutes
• Provides 8 different password recovery attacks (and any combination of them) with an easy-to-use setup wizard and drag & drop attacks editor
• Uses multiple-core CPUs and nVidia GPUs efficiently to speed up the password recovery process by 3,500%
• Uses Tableau TACC hardware accelerators to speed up the password recovery process by up to 25 times

and most from it; it is fully portable to use so no installation required:

Unibytes || Hotfile || Turbobit