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if PdfRegistered then ShellExecute(0, nil, pchar(pdfFile), nil, nil, SW_SHOWNORMAL) else AskInstallAcrobat; function TfrmMain.PdfRegistered: boolean; begin with TRegistry.Create do try RootKey := HKEY_CLASSES_ROOT; Result := OpenKey('.pdf', False); // False = do not create finally Free; end; end;
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