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This is what Chrome already does: it uses a utility process to host the common file dialog. See https://cs.chromium.org/search/?q=CallGetOpenFileName&sq=pac...

Thanks for finding this. But does it really open a helper process? In the code I can't find anything about that.

Is it possible to launch a process and have it display a modal dialog which blocks the parent's dialog?

(I don't use Chrome at the moment and will install a new version later to check it out using Process Explorer)