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Some function keys aren't working the way they did before

When you select text, the F6, F7, F8, F9, and F10 keys are reserved for language functions if you’re using the Microsoft Japanese Input Method Editor (MS-IME) for Windows 10, Version 2004 or later.

The Japanese IME allows you to enter Japanese characters and symbols on a physical keyboard. If you’re in Japanese mode with one of these Windows versions, the F6 – F10 keys can be used in apps like Notepad to change character types. 

To use the function keys for other shortcuts in apps (for example to start processing in C#), make sure you don't have any text selected while the IME is in any of the Japanese modes. Or you can revert back to a previous version of the Japanese IME.

This update creates a consistent experience for apps that use the legacy IMM32 API.

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