LLin wei tingParticipantForum|Forum|3 years agoMay 17, 2022QuestionUnable open pdfForum|Forum|3 years agoMay 17, 20221 reply371 viewsI setup Acrobat reader dc. Every time I try to open pdf file it shows: "Are you sure the allowed and forbidden file attachment types are reset to default?" All the pdf files have the same situation and can not be opened! thanksInstall update and subscribe to AcrobatStandards and accessibilityPDF forms