It sounds like you're looking for information or a guide regarding the Microsoft-Windows-NetFx3-OnDemand-Package.cab file, typically used to install .NET Framework 3.5 offline on Windows systems.
Need to deploy .NET 3.5 offline?
Grab the CAB from a Windows ISO, run the single DISM command above, and move on with your day. microsoftwindowsnetfx3ondemandpackagecab extra free
dism /online /add-package /packagepath:D:\sources\sxs\microsoft-windows-netfx3-ondemand-package.cab
In modern versions of Windows (10 and 11), Microsoft uses a feature called "Features on Demand". Instead of pre-installing every optional component (which would bloat the operating system), Windows keeps the installation files (stored in a .cab or cabinet file) tucked away. It sounds like you're looking for information or
Compatibility: All versions of Windows 10, Windows 11, and Windows Server 2016/2019/2022. Mount a Windows 10/11 installation ISO (official media