For this step in the calibration process, you are asked if you already have the Bragg ring positions in a standard Bruker calibration file. These files are actually quite simple, and you can create one yourself using most standard text editors with the provided file (agbe.std) as a template. The first line is a title, and the each remaining line consists of a d-spacing (in angstroms) and an intensity (which is not used). Note however that this is one place where the number format is not locale-dependent; the d-spacings should all use the American format. That is, a d-spacing that is a little over 45 Angstroms should be written as 45.3 rather than 45,3.
You set the number of rings in the previous step; if you answer "Yes" to the query in this box then you will navigate to the file you want and use the first N reflections in that file.
Click Next when you are ready to go on to the next step, Back to return to the previous step, or Restore to abort the entire process.