p5r 16:10 python script

import sys
import shutil
from pathlib import Path

print("===============================================")
print(" 16:9 -> 16:10 Aspect Ratio Patcher (Fast)")
print(" Replaces float 1.7777778 with 1.6")
print("===============================================\n")

exe_path = Path.cwd() / "P5R.exe"

if not exe_path.exists():
    print("ERROR: P5R.exe not found in this folder.")
    print("Put this script next to the EXE or edit exe_path.")
    input("Press ENTER to exit")
    sys.exit(1)

print(f"Target EXE:\n  {exe_path}\n")

backup_path = Path(str(exe_path) + ".backup_before_16by10")
if not backup_path.exists():
    print(f"Creating backup:\n  {backup_path}")
    shutil.copy2(exe_path, backup_path)
else:
    print(f"Backup already exists:\n  {backup_path}")

print()
print("Reading EXE bytes...")
data = bytearray(exe_path.read_bytes())
print(f"File size: {len(data):,} bytes\n")

FROM = bytes([0x39, 0x8E, 0xE3, 0x3F])
TO   = bytes([0xCD, 0xCC, 0xCC, 0x3F])

print("Searching for 16:9 aspect constant (1.7777778)...")

count = 0
pos = 0
while True:
    index = data.find(FROM, pos)
    if index == -1:
        break
    data[index:index + len(FROM)] = TO
    count += 1
    pos = index + len(FROM)

print()
print("===============================================")
print(f"  Total replacements applied: {count}")
print("===============================================\n")

exe_path.write_bytes(data)

print(f"Patched EXE saved as:\n  {exe_path}")
print(f"Original backup kept as:\n  {backup_path}\n")
input("Press ENTER to exit")