At the bottom of the File/Read submenu there is a list of four FLUENT case files that you most recently read or wrote. To read one of these files into FLUENT, select it in the list. This allows you to read a recently used file without selecting it in the Select File dialog box.
Note that the files listed in this submenu may not be appropriate for your current session (e.g., a 3D case file can be listed even if you are running a 2D version of FLUENT). Also, if you read a case file using this shortcut, the corresponding data file is read only if it has the same base name as the case file (e.g., file1.cas and file1.dat) and it was read/written with the case file the last time the case file was read/written.