How does Win7 system cancel file association? :
1. Click the Start menu — Run, and type "“regedit" in the Run column. Press Enter;
2. Enter the Registry Editor and click on it. Open: "HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionExplorerFileExts.pdf;
3, under the "OpenWithList", under the registration item, except the "default" & rdquo; registry keys in the right window are deleted, and finally Delete “UserChoice” registration items;
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