|fname||The name of the file to append to.|
This function opens the text file with the indicated filename
for writing (if the file does not exist, it is created),
returning the unique id of the file that which should be
stored in a variable as it will be used for all further actions to
do with that file. The position within the file for writing to is
set to the last line of text that the file contains. Note that if
the file can't be created (because of an illegal filename,
for example) the function will return -1.
NOTE: You can only have a maximum of 32 files open at any one time. You should also always close files when finished as this writes the information and frees the memory associated with the file.
WARNING! This function may not work as you expect due to GameMaker Studio 2 being sandboxed! Please see the section on File System Limits for more information.
file = file_text_open_append(working_directory + "save.txt");
This would open "save.txt" from the same directory as the game and store the file id in the variable "file".