This script changes runway numbers directly in MSFS 2020 BGL files.

List runway changes in runways.csv, configure the script, then run python rename_runways.py.

Configuration

Set via command argument or in the top section of rename_runways.py
-x / TEST_MODE : when true only outputs details without actually changing the BGL files
-r / MSFS_ROOT : root path of the MSFS data folder (the folder that contains the Official and Community folders)
-b / BACKUP_DIR : backups BGLs in this directory if they are inside the MSFS data folder and no backup already exists at the backup directory. Use "" / None to disable backup

runways.csv format (separated by ;):

• path to BGL file (can use the placeholder , which will be substituted with the configered root path of the MSFS data folder)
• ICAO ident of the airport
• Old runway number, incl. optional designator and leading 0 (e.g. 03L, 15)
• New runway number, incl. optional designator and leading 0 (e.g. 03L, 15)