Sm64config.txt

Unlike a JSON or XML file, sm64config.txt is a plain text list of arguments. Each line is a separate flag. Lines starting with # are ignored (comments).

Here is a typical default configuration:

# SM64 Config File
--windowed
--resolution 1280 720
--framerate 30
--no-audio
# --skip-intro
# --enable-texture-dumping

Let’s break down the essential parameters. sm64config.txt

The decompilation codebase (written in C) loads this file during engine initialization. Typical loading routine:

Example pseudo-C from sm64ex:

struct Config 
    int window_width;
    int window_height;
    int fullscreen;
    int vsync;
    int framerate_limit;
    // ... etc.
 gConfig;
void config_load(void) 
FILE* file = fopen("sm64config.txt", "r");
if (!file) return;
char line[256];
while (fgets(line, sizeof(line), file)) 
char key[64], val[64];
if (sscanf(line, "%63s = %63s", key, val) == 2) 
if (strcmp(key, "window_width") == 0)
gConfig.window_width = atoi(val);
// ... etc.
fclose(file);

audio_enabled = 1 master_volume = 100 music_volume = 80 sfx_volume = 80

key_left = A key_right = D key_up = W key_down = S key_a = J key_b = K key_z = L key_start = Enter key_c_up = I key_c_down = K key_c_left = J key_c_right = L Unlike a JSON or XML file, sm64config

It’s crucial to understand:
The original Super Mario 64 (Nintendo 64) never used sm64config.txt.
This file exists only in decompilation-based PC ports. Official Nintendo emulation releases (Switch Online, Wii Virtual Console) do not have or need such a config.

Therefore, sm64config.txt is a community-added feature for flexibility, akin to .ini files in many PC games of the late 1990s/early 2000s. Let’s break down the essential parameters