IntuneWin32App is a PowerShell module designed for managing Windows 32-bit line-of-business applications in Microsoft Intune. It automates the entire lifecycle of Win32 app management, including packaging applications into the .intunewin format, creating/updating/deleting apps in Intune via Microsoft Graph API, managing assignments (to groups, all users, or all devices), and handling relationships such as dependencies and supersedence. The module implements multiple OAuth 2.0 authentication flows (interactive, device code, client secret, and client certificate) without external dependencies, providing a self-contained solution for secure Graph API interactions. The architecture follows a modular PowerShell module pattern with clear separation of concerns: public functions (user-facing cmdlets) in the Public directory, private helper functions in the Private directory, and a central module manifest. Key entry points include Connect-MSIntuneGraph for authentication, New-IntuneWin32AppPackage for creating .intunewin packages, and various Add/Set/Get functions for app and assignment management. Data flows involve authentication token acquisition, optional app packaging, Graph API calls for app creation/modification, and subsequent assignment/relationship operations. The module relies on Microsoft Graph API endpoints, Azure AD for authentication, and optionally the IntuneWinAppUtil.exe tool for packaging. Notable engineering practices include consistent parameter validation, standardized error handling, reusable API communication logic with retry/pagination mechanisms, and a clean pattern for constructing JSON payloads using ordered hashtables. The module demonstrates significant effort in implementing native OAuth 2.0 flows and maintaining compatibility with evolving Intune features through regular updates.