创建文本文档，复制以下内容
Windows Registry Editor Version 5.00; Change Extension's File Type[HKEY_CURRENT_USER\Software\Classes\.jpg]@="PhotoViewer.FileAssoc.Tiff"; Change Extension's File 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\.pcx]@="PhotoViewer.FileAssoc.Tiff"; Change Extension's File Type[HKEY_CURRENT_USER\Software\Classes\.tiff]@="PhotoViewer.FileAssoc.Tiff"; Change Extension's File Type[HKEY_CURRENT_USER\Software\Classes\.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。
再点击图片时提示打开工具时出现图片查看器，选择，并勾选始终使用此软件打开。即可。
