The .NET Compact Framework is a collection of runtime libraries which allow you to run .NET Compact 3.5 applications and services on your Windows Mobile device. If you have been getting error messages “Newer version of Dotnet framework required” while executing newly installed applications on your Windows Mobile device you may need to get a compact version of .Net framework for your device.
However it is not a mandatory install for Windows Mobile device owners, vut .NET Compact Framework is strongly recommended for all users looking to get extra from their device by trying out the full range of software available.
Download WLW Plugin: InsertFilePlugin.msi
The link below is not working. Cannot download
http://image.windowsvj.com/Runprogramsunderthe.NETCompactFramework_5CE/InsertFilePlugin.msi
Pl try again.. its working here