File associating problem

Here the piece of code i have on my script, but for some reason is not working, I've read all the posts, etc...and i cant figure out why it is.

WriteRegStr HKCR ".psd" "" "MyProgram.exe"
WriteRegStr HKCR "MyProgram.exe" "" "My Program File"
WriteRegStr HKCR "MyProgram.exe\DefaultIcon" "" "$INSTDIR\bin\MyProgram.exe,1"
WriteRegStr HKCR "MyProgram.exe\shell" "" "open"
WriteRegStr HKCR "MyPrgram.exe\shell\open\command" "" '$INSTDIR\bin\Myprogram.exe"%1"'

I have another photo editing program wich works with file associating, but its adding this line in the registry:

PersistentHandler and then some hexadec string.

thanks!

MyPrgram is not MyProgram

Space before %1 and some other corrections
WriteRegStr HKCR "MyProgram.exe\shell\open\command" "" '"$INSTDIR\bin\Myprogram.exe" %1'

WriteRegStr HKCR "MyProgram.exe\shell" "" "open"
line may be skipped I guess

I made those changes, but still not working, i wonder if you actually have to add more stuff when it comes to image files??

Any ideas?

Solved! thanks!! it was actually the space between the exe file and the %1

thanks!!