Programming language file extensions that match ISO 3166-1 alpha-2 country code

# Summary The ISO 3166-1 alpha-2 standard assigns two-letter country codes that coincidentally match file extensions for numerous programming languages. Notable examples include .rs for Rust (Serbia), .py for Python (Paraguay), .ru for Ruby (Russia), and .md for Markdown (Moldova), creating an unintended overlap between country codes and programming language identifiers.