I decided to modify MicroPython for the ESP32 by adding a screen and buttons. To achieve this, I created a graphical interface with an explorer, from which I hope you can launch files.
mp_task in main.c in the MicroPython repository

if (pyexec_mode_kind == PYEXEC_MODE_FRIENDLY_REPL && ret != 0) {
    int ret = pyexec_file_if_exists("main.py");
    if (ret & PYEXEC_FORCED_EXIT) {
        goto soft_reset_exit;
    }
}

for (;;) {
    if (pyexec_mode_kind == PYEXEC_MODE_RAW_REPL) {
        vprintf_like_t vprintf_log = esp_log_set_vprintf(vprintf_null);
        if (pyexec_raw_repl() != 0) {
            break;
        }
        esp_log_set_vprintf(vprintf_log);
    } else {
        if (pyexec_friendly_repl() != 0) {
            break;
        }
    }
}

The code runs at this location, but it always executes the same file. I've tried passing the file path to pyexec_file_if_exists and trying to run the Python file import main in repl, but when I run it this way, my GUI freezes and the file doesn't execute. I suspect repl is to blame. Has anyone done something similar? What should I look for?