@Sebastian-Roth Thanks , this looks very promissing, just tested it on one computer and it looks just right. Fog now recongnized the system partition as a fixed partition and set the The d1.fixed_size_partition :1:3 .
I will need to do some more testing to evaluate this, but looks good atm. This could in other words just be a OS language “bug” , I think swedish windows 10 version by default name the “System Reserved” partition just “System” Which would make fog miss the fixed partition and cause me all the trouble. 
It is however very doable to manuallt rename a partition prior capturing it.
thanks for the good advices, I hope this turn out to be great.