Accidental and Intentional File Deletions.
RAID Hard Drive Failures.
Reformatted Hard Drives.
Fire, Flood or Earthquake Disasters.
Your data can be corrupted if you have a logical hard drive failure or if a virus
has attacked your files. This is because the header information or the crc (cyclic redundancy check) is corrupted.
There are a host of other reasons why corrupt files or corrupted databases
can´t open. Most likely the media is damaged, or an electrical anomaly has occurred.
Our best advice...save your corrupted file somewhere safe (external storage media)
and see if you can open the damaged file using another computer.