新建记事本，输入已下内容：

Windows Registry Editor Version 5.00

; Change 电脑 Extension's File Type

[HKEY_CURRENT_USER\Software\Classes\.jpg]

@="PhotoViewer.FileAssoc.Tiff"

; Change Extension's File 电脑 Type

[HKEY_CURRENT_USER\Software\Classes\.jpeg]

@="PhotoViewer.FileAssoc.Tiff"

; Change Extension's File Type

[HKEY_CURRENT_USER\Software\Classes\.gif]

@="PhotoViewer.FileAssoc.Tiff"

; Change Extension's File Type

[HKEY_CURRENT_USER\Software\Classes\.png]

@="PhotoViewer.FileAssoc.Tiff"

; Change Extension's File Type

[HKEY_CURRENT_USER\Software\Classes\.bmp]

@="PhotoViewer.FileAssoc.Tiff"

; Change Extension's File Type

[HKEY_CURRENT_USER\Software\Classes\.tiff]

@="PhotoViewer.FileAssoc.Tiff"

; Change Extension's File 电脑 Type

[HKEY_CURRENT_USER\Software\Classes\.ico]

@="PhotoViewer.FileAssoc.Tiff"

保存后，修改后缀为reg。双击运行