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Choosing a version of Microsoft Office Primary Interop Assembly

I am writing a .NET application that uses Excel. Any version of Excel from version 97 or later is acceptable, but I don’t know which version any particular client will have. Installing Microsoft Office PIA through the bootloader is not a problem.

What version of PIA should be included in the installation package? Do I need each version of PIA or will one version of PIA cover all required versions of Excel?

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Using the earliest version of PIA should work, albeit informally, see MS Office PIAs "Backward Compatibility" . Using a later version may or may not work, and is not recommended.

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