diff --git a/script-resources/factorio/property_tree.py b/script-resources/factorio/property_tree.py
new file mode 100644
index 0000000..24629e2
--- /dev/null
+++ b/script-resources/factorio/property_tree.py
@@ -0,0 +1,65 @@
+# <https://wiki.factorio.com/Property_tree>
+# <factorio.https://wiki.factorio.com/Data_types>
+# <https://github.com/credomane/factoriomodsettings/blob/master/src/ModSettingsDeserialiser.js>
+# <https://github.com/credomane/factoriomodsettings/blob/master/src/ModSettingsSerialiser.js>
+# <https://www.devdungeon.com/content/working-binary-data-python>
+
+import struct
+
+
+def read_bool(buf):
+    return buf.read(1)[0] == 1
+
+
+def read_number(buf):
+    return struct.unpack("<d", buf.read(8))[0]
+
+
+def _read_length(buf):
+    return struct.unpack("<I", buf.read(4))[0]
+
+
+def read_string(buf):
+    is_empty = read_bool(buf)
+    if is_empty:
+        return ""
+    len_ = buf.read(1)[0]
+    if len_ == 0xFF:
+        len_ = _read_length(buf)
+    return buf.read(len_).decode("utf8")
+
+
+def read_dictionary(buf):
+    len_ = _read_length(buf)
+    value = {}
+    for _ in range(len_):
+        key = read_string(buf)
+        value[key] = read(buf)
+    return value
+
+
+def read_list(buf):
+    len_ = _read_length(buf)
+    value = []
+    for _ in range(len_):
+        read_string(buf)
+        value.append(read(buf))
+    return value
+
+
+def read(buf):
+    type_, _any_type_flag = buf.read(2)
+    if type_ == 0:
+        return None
+    elif type_ == 1:
+        return read_bool(buf)
+    elif type_ == 2:
+        return read_number(buf)
+    elif type_ == 3:
+        return read_string(buf)
+    elif type_ == 4:
+        return read_list(buf)
+    elif type_ == 5:
+        return read_dictionary(buf)
+    else:
+        raise Exception("unknown property tree type 0x{:02x}".format(type_))
diff --git a/scripts/factorio-dump-mod-settings b/scripts/factorio-dump-mod-settings
new file mode 100755
index 0000000..2f817b3
--- /dev/null
+++ b/scripts/factorio-dump-mod-settings
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+# <https://wiki.factorio.com/Mod_settings_file_format>
+# <https://forums.factorio.com/59851>
+# <https://www.dropbox.com/sh/uscmj9y3cjfwpsr/AAD35_ZZu64EBi0awLA07fxga?dl=0>
+# <https://github.com/credomane/factoriomodsettings/blob/master/src/FactorioModSettings.js>
+
+import sys
+import os
+from pathlib import Path
+import struct
+import json
+
+sys.path.insert(1, os.path.join(os.path.dirname(__file__), "..", "script-resources"))
+import factorio.property_tree
+
+
+with open(Path.home() / ".factorio" / "mods" / "mod-settings.dat", "rb") as f:
+
+    version_main, version_major, version_minor, version_developer = struct.unpack(
+        "<HHHH", f.read(8)
+    )
+
+    always_false_flag = factorio.property_tree.read_bool(f)
+    assert not always_false_flag
+
+    deserialized_data = {
+        "factorio_version": {
+            "main": version_main,
+            "major": version_major,
+            "minor": version_minor,
+            "developer": version_developer,
+        },
+        "data": factorio.property_tree.read(f),
+    }
+
+    print(json.dumps(deserialized_data, indent=2))