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Home/ Questions/Q 4346232
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Editorial Team
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Editorial Team
Asked: May 21, 20262026-05-21T12:08:46+00:00 2026-05-21T12:08:46+00:00

We have 2 desktop host apps written on .NET 3.5 and .NET 4.0. We

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We have 2 desktop host apps written on .NET 3.5 and .NET 4.0.
We have 3 add-ins written on .NET 3.5.
One add-in is written on .NET 4 – “NET4APP”.

We want to integrate host apps and add-ins using .NET 3.5 host app for all add-ins.

They can be bundled in any combination with MSI package.

We do not want to make customer to use .NET 4 if they do not have it and do not use NET4APP.

Is there any way to load .NET 4 app (or .NET 4 runtime) into .NET 3.5 app?

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  1. Editorial Team
    Editorial Team
    2026-05-21T12:08:47+00:00Added an answer on May 21, 2026 at 12:08 pm

    The customers with .NET4, you can simply run the whole thing under .NET4. If you provide two setups (one with NET4APP, and one without) everyone will be happy.

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