There are various reason Data stored in a computer system may get damaged due to various factors like sudden system shutdown, malware programs and corrupt hard disk. To recover such type of file you need a file recovery software, now a days when you search on the internet lots of companies offering a file recovery software with trial version. In trial version you can see the preview of recovered data. Some of well known companies are :

Kernel for Windows
RecoveryFix for Windows
Stellar for Windows
Unistal

Thanks