Worked on the facebook/buck2-prelude repository to address a critical issue affecting Windows builds, focusing on build systems and Windows compatibility. Implemented a targeted fix in Bzl that corrected path separator handling during protobuf generation, which previously caused the gRPC plugin to become unreadable and blocked successful builds on Windows platforms. By aligning the Windows genrules with those used on Linux and macOS, the solution restored readable plugin output and eliminated cross-platform build errors. This work improved the reliability of the build process and streamlined developer onboarding for Windows users, ensuring consistent behavior across different operating systems in the build pipeline.