When reading in NMR files into Mnova the “fid” file from the Varian instruments (walkup 400, scheduled 500 and 800) is the file you want; however, for the Bruker instruments (walkup 500, scheduled 600, 700 (x2)) you want to read in the file from X/pdata/1/1i or 1r file (where X is the dataset name and “1” is the experiment number).