If the file type is supported by Adobe Reader, please open Control Panel,Īssociate a file type or protocol with a program, then locate the file format and make sureĪdobe Reader is set as the default program for the file type. You can verify this by consulting the Adobe Reader support. Which format of file are you previewing in Outlook? Please first make sure the format is supported by Adobe reader. Have you checked if the PDF Preview Handler is available and shows as enabled in File > Options > Trust Center > Trust Center Settings > Attachment Handling > Attachment and Document Previewers?
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