CLI for framework 2


My business application is built with .net framework 2.
I would like to use CLI interface of LibreOffice 5 but the cli dll (cli_basetypes.dll,…) are building with framework 4.
So my application couldn’t reference them.
I don’t want to change framework of my application.
Is it a way to use the cli dll ?
Or is existing CLI version build with framework 2 or 3.51?

Best regards, Yannick.