win‑guid is a small Node.js library that converts between the canonical GUID string format and the Windows‑specific “legacy” GUID byte layout, which uses mixed‑endianness for the first three fields. It provides a simple parser (`parseWindowsGuid`) and a `Guid` class for round‑tripping GUIDs, targeting developers who need to read or write Microsoft binary formats (COM/OLE, GPT, UEFI, Active Directory, etc.) that store GUIDs in this legacy encoding.