新建一个TXT文本文档，把以下代码复制粘贴到其中：
注：你可以根据需要按同样的格式增减或修改其中的图片格式代码
Windows Registry Editor Version 5.00
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.jpg]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.jpeg]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.gif]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.png]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.bmp]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.pcx]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.tiff]
@="PhotoViewer.FileAssoc.Tiff"
; Change Extension's File Type
[HKEY_CURRENT_USERSoftwareClasses.ico]
@="PhotoViewer.FileAssoc.Tiff"
然后把该文本文档重命名为 Windows_photo_viewer.reg （或任意名称），然后双击运行该 reg 注册表文件把数据导入注册表中即可。