1. Open Notepad in Windows and copy the code below and paste it into Windows Notepad.
2. Note: The code above allows Photo Viewer to open jpg, jpeg, gif, tiff and ico file extension.
3. Save it as “PhotoViewer.reg” (Reg refers to Window’s registry file extension).
4. Open Notepad in Windows and copy the code below and paste it into Windows Notepad.
5. Double click on the registry file to apply it into Windows Registry. Click OK to confirm merging registry and click OK again to close the dialog box.
6. Open Windows Run Dialog Box (Windows Key + R), then type in “ms-settings:”, this will pop up a window. Click “System” and Click “Default apps”. Under Photo Viewer category, select “Windows Photo Viewer”.


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"