Win7 file association error how to cancel

  
            1. Click the Start menu & mdash; Run, and enter "ldedit" in the Run column, press Enter;
Run the input regedit
2. Enter the Registry Editor and click to open: " HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerFileExts.pdf ;
Registry Editor
3, under the "OpenWithList", under the registration item, in the right window except the "default" & rdquo; registry keys are deleted, and finally Delete “UserChoice” registration items;

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