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Is there a stop (removable piece) on the interior side of glass?
If so, my approach would be to remove the stop, remove the glass, and then cut off the exterior "stop". From the looks of the picture the rotting is only happening in the stop location. Once cut off you should be left with a flat piece of wood. Go to the store and buy a piece of 1/2" minimum thickness wood (1/2" 1/4 round is ideal). cut to length and nail onto the window sill at the exterior with the vertical leg against where the glass will be. Re-install the glass and interior stop. Prime the exterior, paint the exterior and then fill the void between the new stop and the glass with caulk or glazing compound.
That's my approach based on what I see.....
p.s. Looks like you need to paint the balance of the frame before it all begins to rot.
If so, my approach would be to remove the stop, remove the glass, and then cut off the exterior "stop". From the looks of the picture the rotting is only happening in the stop location. Once cut off you should be left with a flat piece of wood. Go to the store and buy a piece of 1/2" minimum thickness wood (1/2" 1/4 round is ideal). cut to length and nail onto the window sill at the exterior with the vertical leg against where the glass will be. Re-install the glass and interior stop. Prime the exterior, paint the exterior and then fill the void between the new stop and the glass with caulk or glazing compound.
That's my approach based on what I see.....
p.s. Looks like you need to paint the balance of the frame before it all begins to rot.