I think.. this option is already available in 2013..
In Office Menu.. Open > you have a lots of PIN, to set a special file always available .. irrespective of recent open file list.. You can use it for same purpose.. as mentioned above by oldChippy.. and excel has already a lots of feature..
we are here.. to help you .. using that feature in right direction, and in right time..
Useful or useless.. is only depend on you.. not ours..
Or you can create a PERSONAL macro.. to open a specific file.. and add the maccro in the QAT or YourMenu > YourGroup tab..