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Get 50% OFF QuickBooks for 3 months*
Buy nowI feel your pain & Frustration, I run a firm and this started happening me too, couldn't open ANY clients files so needless to say I HAD to fix it.
Have you tried changing your Computers Date formatting to have slashes (/) instead of dashes (-)?

Sounds crazy but resolved this for me when none of the other solutions worked.
Was an excellent QB support rep who suggested it also.