Any file can be represented as a binary string, and a binary string is just an integer value - which is to say binary strings are simply indexes of files in bin

Any file can be represented as a binary string, and a binary string is just an integer value - which is to say binary strings are simply indexes of files in binary space (i.e. the set of all possible permutations of bits). Looks to me like nfs is simply transforming a binary space index into a pi-space index. Some files may compress to a smaller value than they are in binary space (if you get lucky), but make no mistake, some files will be much much larger (i.e. the files you're trying to store don't show up in pi until an index value that is a virtually infinite number of digits long).