The "Custom commands" feature cannot launch MPV.
windows 11 25H2
winscp 6.5.6
custom command:
Symptom: An error window pops up, displaying an error message roughly identical to the log shown below.
log:
winscp 6.5.6
custom command:
C:\Applications\mpv-lazy\mpv.exe "webdav://!U:!P@!@:!#!/!"
log:
* 2026-05-26 10:03:07.520 (EOSExtException) Cannot execute 'C:\Applications\mpv-lazy\mpv.exe'. * 2026-05-26 10:03:07.520 System Error. Code: 1223. * 2026-05-26 10:03:07.520 操作已被用户取消。 ---- It means "the operation has been cancelled by the user."