I had my ECM8k calibrated by Herb @ Cross Spectrum. Very satisfied with the quick service and returned documentation. Along with the paper and emailed graph results, Herb sent data files for the 3 (0,45,90 degree) response results. These are files of file type FRD (i.e. narrow_band_response__0_degree.FRD) that "mostly" look like a mic cal file (frequency <space> response) that I expected to see but have an additional zero on each line. Also, they are not directly readable (i.e. flat text) via Notepad. I can read them via Word, Wordpad, and another text editor. My question is, can I change the file type from FRD to TXT and expect my RTA program (TrueRTA) to properly read them as-is with the trailing zero on each line? I can certainly edit all that out and rename the files. But I was curious as to the file format, content, etc, that he supplied.