Win32 and registry

[MajorDad]

Hi all

In registry i have do a new key in HKEY_CLASSES_ROOT\*\shell\Convert\command
I input following line as sample as REG_SZ
D:\tmp\nconvert -out png "%1"

Its like D:\tmp\nconvert -out png test.jpg in DOS

Now i klick on a picture test.jpg > context menue > Convert ..
The picture i selected is not converted to png O_o
Only the 'open with' dialog appear

I try the same with %%1 like the usage.txt say

Use NConvert not the %1 for the first parameter as the filename i selected ?

Thanks
MajorDad

*edit* haha .. no answer is a answere .. thx -_-