保存文件后缀为reg

例如：win10-pic-open.reg

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\.tiff] 
@="PhotoViewer.FileAssoc.Tiff" 
; Change Extension's File Type 
[HKEY_CURRENT_USER\Software\Classes\.ico] 
@="PhotoViewer.FileAssoc.Tiff"

双击执行即可