diff --git a/tests/test_launcher.py b/tests/test_launcher.py
index a082924..7a352a9 100644
--- a/tests/test_launcher.py
+++ b/tests/test_launcher.py
@@ -4,6 +4,7 @@ import os
 from pathlib import Path
 import re
 import socket
+import struct
 import subprocess
 import sys
 import tempfile
@@ -195,6 +196,28 @@ def main():
     assert not found, 'OpenOrbis Linux-valued constant used directly:\n' + '\n'.join(found)
     print('PASS no OpenOrbis constant with a Linux value is used directly', flush=True)
 
+    # The package's param.sfo, as the PS4 reads it (built by `make -C launcher`).
+    sfo = ROOT / 'build/launcher/pkg/sce_sys/param.sfo'
+    if not sfo.exists():
+        print('SKIP param.sfo checks: build the package first (make -C launcher)', flush=True)
+        return
+    data = sfo.read_bytes()
+    magic, _, keys, values, count = struct.unpack_from('<4sIIII', data)
+    assert magic == b'\0PSF', magic
+    fields = {}
+    for i in range(count):
+        key_at, kind, length, _, value_at = struct.unpack_from('<HHIII', data, 20 + 16 * i)
+        name = data[keys + key_at:data.index(b'\0', keys + key_at)].decode()
+        raw = data[values + value_at:values + value_at + length]
+        fields[name] = struct.unpack('<I', raw)[0] if kind == 0x0404 else raw.rstrip(b'\0').decode()
+    version = (ROOT / 'VERSION').read_text().strip()
+    major, minor = version.split('.')[:2]
+    # Listed under Applications rather than Games, as Apollo Save Tool is.
+    assert (fields['CATEGORY'], fields['APP_TYPE'], fields['ATTRIBUTE']) == ('gde', 1, 32), fields
+    assert fields['TITLE_ID'] == 'CFRE00001' and fields['TITLE'] == 'Control4Free', fields
+    assert fields['APP_VER'] == fields['VERSION'] == f'{int(major):02d}.{int(minor):02d}', fields
+    print('PASS param.sfo: an application, its title, and the version from VERSION', flush=True)
+
 
 if __name__ == '__main__':
     main()
diff --git a/tools/package_launcher.py b/tools/package_launcher.py
index e25843c..f691ff5 100644
--- a/tools/package_launcher.py
+++ b/tools/package_launcher.py
@@ -127,9 +127,14 @@ def main():
     pkgtool = binary / 'PkgTool.Core'
     sfo = 'sce_sys/param.sfo'
     run(pkgtool, 'sfo_new', sfo)
+    # Listed under Applications, not Games: the values Apollo Save Tool ships with
+    # (bucanero/apollo-ps4, built with the same OpenOrbis tools), which lists there
+    # and starts fine. CATEGORY gde is "Non-Game Mini App"; gd, which we had, is
+    # "Game Digital Application". APP_TYPE must stay 1: with 4 ("Freemium") the PS4
+    # refused to start the app (CE-39929-2, firmware 10.01, 2026-10-05).
     entries = {
         'APP_TYPE': ('Integer', 4, '1'), 'APP_VER': ('Utf8', 8, SFO_VERSION),
-        'ATTRIBUTE': ('Integer', 4, '0'), 'CATEGORY': ('Utf8', 4, 'gd'),
+        'ATTRIBUTE': ('Integer', 4, '32'), 'CATEGORY': ('Utf8', 4, 'gde'),
         'CONTENT_ID': ('Utf8', 48, CONTENT_ID), 'DOWNLOAD_DATA_SIZE': ('Integer', 4, '0'),
         'SYSTEM_VER': ('Integer', 4, '0'), 'TITLE': ('Utf8', 128, 'Control4Free'),
         'TITLE_ID': ('Utf8', 12, TITLE_ID), 'VERSION': ('Utf8', 8, SFO_VERSION),