Here's a simple example for a text based file.
##### START ############################################################## !include file_io.inc
# Variable Definitions
int file_handle
str string
str string2
# Sets a variable to a value
set string2 "Hello, World."
fopen file_handle O_RDWR "%n..\baja\somedir\somefile.txt"
if_false
print "\r\nnError opening File!\r\n"
return
end_if
fread_line file_handle string # reads line from file into variable
fset_pos file_handle 0 SEEK_END # sets file position to end of file
fprintf file_handle "%s" string # writes variable to file
fclose file_handle
##### END ##############################################################
PG
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