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Can we use 32 bit COM dll in 64 bit application.

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Yes. For example, see this:[^].

What's important to know: you cannot link 32-bit code and 64-bit directly, statically or dynamically.

In principle, you can even avoid using COM; in this case you can have two different processes, one would be 32-bit, another 64-bit. One such process can serve up others regardless their target platforms in the same manner of a library via remote procedure call (RPC) mechanism.

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