Error while reading file from CDROM

[VinegarLove]

Hi,
I have an ELF Executable with some data files and I would like it to be packaged into an ISO readable by the emulator.

I'm currently facing the problem of loading files into memory only when the ELF is packaged inside the ISO.

Using PCSX2 and enabling host filesystem, I can successfully load the file via SDL2 API.

// Open the file
SDL_RWops *file = SDL_RWFromFile("host:DATA/TEST.TXT", "r");
if (!file) {
    printf("Failed to open file: %s\n", SDL_GetError());
    exit(1);
}

However, when I try to read from the packed ISO with the following line, the file won't load correctly.

SDL_RWops *file = SDL_RWFromFile("cdrom0:DATA/TEST.TXT", "r");

I've attached the logs.
You may notice that there's an instruction that says "cdrom0:DATATEST.TXT" without the "/", but the file gets load correctly while using the host filesystem.

Trying to read anything from cdrom0: result in the same error.
"is not a regular file or pipe"

While accessing to "host:" related path gives just
"No such file or directory"

It seems like the cdrom0 FS isn't mounted for some reason.

EDIT:
The iso is formatted with this command.

    "mkisofs",
    "-udf",
    "-iso-level", "1",
    "-V", "PS2APP_ISO",
    "-o", output_iso,
    "-file-mode", "0400",
    "-dir-mode", "0500",
    "-relaxed-filenames",
    "-duplicates-once",
    "-volset", "PS2APP_ISO",
    "-sysid", "PLAYSTATION",
    "-appid", "PS2APP",
    disk_folder

Any help is appreciated 🙏

Thanks.
pcsx2_log.txt

[israpps]

CDVDMAN.IRX (the module that registers the cdrom0:\ device) is the only one that expects windows-like paths with backslashes.

[VinegarLove]

I tried with both Unix and Windows like backslashes and it still doesn't work.
I think SDL converts the call to be Unix like under the hood, which is why in the log I always see:
host:/DATA/IMG.PNG
or
cdrom0:/DATA/IMG.PNG
no matter what.

I'll try using the module directly and give you a feedback.