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Editorial Team
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Asked: 2026-05-14T15:23:14+00:00

The recommendation used to be Do not write in-process shell extensions in managed code.

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The recommendation used to be “Do not write in-process shell extensions in managed code.”

But with .NET Framework 4 and In-Process Side-by-Side the main reason not to write shell extensions in managed code should be resolved.

With that said, I have three questions.

  1. Is it now okay to write shell extensions in managed code?
  2. Which problems, if any might there be with writing shell extensions in managed code?
  3. What reasons might there be to write shell extensions in unmanaged code?
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1 Answer

  1. Editorial Team

    It is now OK to write shell extensions in .NET 4 managed code. You should still avoid writing shell extensions in .NET 3.5 or earlier, because these earlier versions don’t support in-proc side-by-side with each other.

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