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ID Ransomware
Submit a sample of the compromised files for their review.
They will reply and let you know what you are dealing with.
From what we know now, your files are not recoverable.
Your only solution would be to restore the files from a good backup if you have one.
The compromised files can be transferred to a CD or Flash drive.
Should a solution be found in the future you may be able to restore them.
It's never to late to use common sense to guard against being infected.
Tips on how to prevent ransomware attacks
Ransomware protection: How to keep your data safe in 2024
Good luck.