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I thought wtf too, so I tried it and watched with process monitor. Opening MPC performs synchronous I/O hundreds of times because of a naive system. Reg keys are made to be opened, locked, read, unlocked, and closed thousands of times a second with no problem, but doing that with real files gets you in trouble. Every operation, like opening a file, causes dozens more reads plus a single write. If it was asynch I/O it probably wouldn't be a problem, but MFC is so amazingly inept that it doesn't. CMPlayerCApp::Settings::UpdateData would all have to be rewritten to use a custom ini/registry handler to fix that, unless there's a way to override MFC functions.
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