1) How is the file originally written? Do you just put the array into a "write to binary file" function?
2) How are you "reading" the file. If you are actually copying the ftp file to local PC and then opening it, you probably just need to specify the 2D string array as datatype in the read from binary file.
3) If you are using the Get Buffer VI, then consider changing your file type from binary to ascii if you want it to be easier to read. Then you can use functions like spreadsheet string to array to return it to the original. Otherwise you'll need some extra code.
Ian