You can't save a string array to a file unfortunately. You could put every entry together into one string with some kind of separator after each one and save it as a TXT though. You would have to load the TXT and split all the parts up to convert them into a string array later.
Oh sorry lol. As stated above this is the only way to do this. I've made 2 simple functions that let you save/load arrays into an already defined array.
Eg:
DIM T$[9]
T$[0]="Test"
T$[1]="HI"
SAVESTR "FILENAME",T$
LOADSTR "FILENAME",DESTINATIONARRAY$
If you will be storing sensitive data to a file (high scores, progress) I highly, highly recommend using the DAT file type instead of TXT
DAT stores an array of numbers, and cannot be viewed or changed in the text editor
DIM D[1]
D[0]=MYNUMBER
SAVE "DAT:SAVEDATA",D
You want to save not very often so the user is not bombarded by dialogs saying "Would you like to save blah blah blah?"