It is my failure. I'm sorry. Two places...
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diff --git a/src/os_win32.c b/src/os_win32.c
index 62a2bcdca..a452b9d99 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -3126,8 +3126,10 @@ mch_dirname(
{
WCHAR wcbuf[_MAX_PATH + 1];
char_u *p;
+ DWORD lfnlen;
- if (GetLongPathNameW(wbuf, wcbuf, _MAX_PATH) != 0)
+ lfnlen = GetLongPathNameW(wbuf, wcbuf, _MAX_PATH);
+ if (lfnlen != 0 && lfnlen < _MAX_PATH)
p = utf16_to_enc(wcbuf, NULL);
else
p = utf16_to_enc(wbuf, NULL);
