File format or File Extension is not Valid While the “file format or file extension is not valid” error is typical, some users have also reported the error “QuantumXLAddIn.xlam is not a valid add-in” or a Windows Security Popup “Action Blocked: Your administrator caused Windows Security to block this action. Contact your help desk” which has the […] The post Support – File Format or Extension Not Valid appeared first on SigmaZone.
