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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T07:56:29+00:00 2026-05-31T07:56:29+00:00

I have two processes, one 32-bits, another 64-bits and I need to duplicate some

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I have two processes, one 32-bits, another 64-bits and I need to duplicate some handles that are used by the other process.

In x64, HANDLE size is enough to hold the 32-bit handle but when I call DuplicateHandle in the x86 process targetting the x64 one, does the o.s. ensures that the resulting handle will fit in 32-bit HANDLE type?

Regards,
Mauro.

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  1. Editorial Team
    Editorial Team
    2026-05-31T07:56:30+00:00Added an answer on May 31, 2026 at 7:56 am

    Windows will manage it, its stated in the docs for the call;

    DuplicateHandle can be used to duplicate a handle between a 32-bit
    process and a 64-bit process. The resulting handle is appropriately
    sized to work in the target process

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