No key binding found for arrows keys on Windows tablet keyboard

mpv Information

mpv v0.39.0-929-gee07dcf4c Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Mar  2 2025 00:10:18
libplacebo version: v7.350.0 (v7.349.0-38-g02f4f98-dirty)
FFmpeg version: N-118594-ge8d4c5598
FFmpeg library versions:
   libavcodec      61.33.102
   libavdevice     61.4.100
   libavfilter     10.9.100
   libavformat     61.9.107
   libavutil       59.58.100
   libswresample   5.4.100
   libswscale      8.13.100

Other Information

- Windows version:
  Windows 10 32-bit (Microsoft Windows [Version 10.0.19044.5487])
  Windows 11 (Microsoft Windows [Version 10.0.26100.3194])
- GPU model, driver and version:
  Intel HD Graphics on Intel Atom Z3735G
  Intel UHD Graphics on Intel Core i3-8145U
- Source of mpv: https://github.com/shinchiro/mpv-winbuild-cmake/releases/tag/20250302, i686 and x86_64-v3
- Latest known working version: n/a
- Issue started after the following happened: n/a

Reproduction Steps

1. Enable touch keyboard on taskbar: https://support.microsoft.com/en-us/topic/enable-and-disable-the-touch-keyboard-in-windows-e2b05375-908d-45ec-b7f7-729349a10c7a
2. Start mpv and open the touch keyboard from the taskbar
3. Type ` to activate REPL
4. Type the arrow keys on the touch keyboard

Expected Behavior

It should work like the old accessibility On-Screen Keyboard. It seems they use different key codes for some reason.

Actual Behavior

Shows error No key binding found for KP_{LEFT,UP,RIGHT,DOWN}

Windows 10 32-bit:
Windows 11:

Log File

output.txt

Sample Files

https://www.youtube.com/watch?v=dQw4w9WgXcQ

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

No source file or test is named. Start by reproducing the issue in mpv's REPL with the Windows touch keyboard, then trace how its arrow-key input becomes KP_* names and compare that with the accessibility On-Screen Keyboard behavior. Done means the touch-keyboard arrows are recognized by the expected bindings without the reported error.