The “Filter” button in the fileselection filters the filenames according to extension. For coordinates files the extensions are “.pdb” “.brk” “.mmcif” and others. For data: “.mtz”, “.hkl”, “.phs”, “.cif” and for (CCP4) maps “.ext”, “.msk” and “.map”. If you want to add to the extensions, the following functions are available:
(add-coordinates-glob-extension extension)
(add-data-glob-extension extension)
(add-map-glob-extension extension)
(add-dictionary-glob-extension extension)
".mycif".
If you want the fileselection to be filtered without having to use the "Filter" button, use the scripting function
(set-filter-fileselection-filenames 1)
If you like your files initially sorted by date (rather than lexicographically, which is the default) use:
(set-sticky-sort-by-date)
Some people prefer that the fileselection for saving coordinates starts in the original directory (rather than the directory from which they last imported coordinates). This option is for them:
(set-save-coordinates-in-original-directory 1)