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Sqpc is one of the malicious programs that belong to the ransomware family called Djvu.
Navigate to this topic.
Upload a ransom note and/or sample encrypted file to identify the ransomware that has encrypted your data.
id-ransomware.malwarehunterteam.com
You ca submit a sample of the compromised files for their review.
They will reply and let you know what you are dealing with and if a solution is available.
As far as we know now there is no solution for this type if infection on the computer or any external drive.
Good luck.