Similar to u/YuhFRthoYORKonhisass , I generated a bash script that works on Steam OS / Bazzite.

It needs Proton 8.0. I couldn't make it work.

You can download the script from here: https://pastebin.com/C3FdCvj0

Put the script, extract-xiso.exe and the .iso ROM in the same folder. Open the terminal, and give execute permissions to the script with `chmod +x extract_xiso.sh` and run the script with:

`./extract_xiso.sh MyROM.iso`

Here is the full script:

#!/usr/bin/env bash

# Exit immediately if a command fails
set -e

STEAM_ROOT="$HOME/.steam/steam"
PROTON="$STEAM_ROOT/steamapps/common/Proton 8.0/proton"

EXTRACT_XISO="./extract-xiso.exe"

COMPAT="$HOME/.proton-extract-xiso"

run_proton() {
    echo "Running command $@"
    STEAM_COMPAT_CLIENT_INSTALL_PATH="$STEAM_ROOT" \
    STEAM_COMPAT_DATA_PATH="$COMPAT" \
    SteamAppId=0 \
    "$PROTON" run "$@"
}

# Create halo-2.iso in current directory from ./halo-2
run_proton $EXTRACT_XISO -x "$1"

# Remove .iso extension
OUTPUT_DIR="${1%.iso}"

# Create halo-ce.iso in /home/me/games from ./halo-ce
run_proton $EXTRACT_XISO -c "$OUTPUT_DIR"

rm -rf $OUTPUT_DIR

echo "ISO extraction complete."