Win7 open file when prompted Windows can not open this file to resolve

1, first click "start-run", enter "ldedit" in the open dialog box to enter the registry editor;
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2, then expand to the left side of the registry and then navigate to "HKEY_LOCAL_MACHINE----SOFTWARE-----Microsoft----Windows----CurrentVersion----policies--- -system & rdquo; item;

3, then right click the mouse to select & ldquo in the space on the right side of the window; new & rdquo; & rarr; DWORD value & ldquo ;, and named & rdquo; Nointernetopenwith & ldquo ;; 4. After double-clicking the newly created "Nointernetopenwith“ key value, change the original 0 to 1 or other non-zero number in the “Value Data“ 5, after the modification is completed, confirm to quit the registry, and then open the file of unknown format will not prompt Windows can not open this file, but will go directly to the open mode dialog box, select the appropriate program to open the file.