Idea-3:
Use gamestudios file functions.

if you use file_var_write you can store a number in a file. With file_str_write, you can write a string to a file.

saving:

file_str_write(handle, "Hi");
file_str_write(handle, "its");
file_str_write(handle, "me");

loading:

file_str_read(handle, str1); //str1 is now "Hi"
file_str_read(handle, str2); //str2 is now "its"
file_str_read(handle, str3); //str3 is now "Me"

there are some alternate versions of file_str_read (look into the manual)
But as you can see, the functions already use seperation.

file_str_read reads until it hits a return/nextline char OR hits a seperator(usually ,).

so for writing you'll always first use file_var_write to note the ID and then start writing your data, and on loading you always do

file_var_read
look which content it means and use its function
after content is read out use file_var_read again

Greetings
Rackscha