win7中的图片查看器，在win10是隐藏的。

将下面的代码保存为reg，运行即可。

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Photo Viewer\Capabilities\FileAssociations]

".tif"="PhotoViewer.FileAssoc.Tiff"

".tiff"="PhotoViewer.FileAssoc.Tiff"

".png"="PhotoViewer.FileAssoc.Tiff"

".jpg"="PhotoViewer.FileAssoc.Tiff"

".jpeg"="PhotoViewer.FileAssoc.Tiff"

".bmp"="PhotoViewer.FileAssoc.Tiff"

".webp"="PhotoViewer.FileAssoc.Tiff"

".jfif"="PhotoViewer.FileAssoc.Tiff"

 ".dds"="PhotoViewer.FileAssoc.Tiff"

 ".ico"="PhotoViewer.FileAssoc.Tiff"