Here is a list of things you should do to recover a corrupted or deleted system file:
Check the back-up folder in case it was accidentally saved there.
Restore the file from the Recycle Bin in case you have accidentally deleted it.
Check System Data Protection such as Volume Shadow Copy in case the file was corrupted.
Run anti-virus to check if the file was compromised in any way.
Run a disk recovery tool to scan your local drive for data.
Reinstall the file from the original source.
