[weter002]

Nerdy,
Спасибо за совет. На "писипортал" нашел в комментах для себя решение -твик реестра.

Код:

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\.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"