Hey, my family is from Norway too!
The process of creating the guide.bin is as follows:
1. Getting makecab.exe to compress guide.xml (which is your formatted xml file, make sure it is called guide.xml). Call the cab file Guide.cab.
2. Encrypt Guide.cab with key (this can be a string converted from base64). The output of the file will be Guide.bin.
3. Change your EPG Headend Backend to show the new key (thats if you generate a new one each time)
4. Download the Guide in MCE!
What language are you writing your application in?
Also, if you'd like, pm me and ill send you the code all ready to go in C#
Cheers,
Jourdan