patch 8.2.2915: MS-Windows: when using "default" for encoding utf-8 is used Commit: https://github.com/vim/vim/commit/ef8706fb84cfe8bd58b1b26b0742e42caf09655b Author: K.Takata <kentkt@csc.jp> Date: Mon May 31 18:40:49 2021 +0200 patch 8.2.2915: MS-Windows: when using "default" for encoding utf-8 is used Problem: MS-Windows: when using "default" for encoding utf-8 is used. Solution: Use the system encoding. (Ken Takata, closes https://github.com/vim/vim/issues/8300)

--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -4453,8 +4453,13 @@ enc_canonize(char_u *enc)
 
     if (STRCMP(enc, "default") == 0)
     {
+#ifdef MSWIN
+	// Use the system encoding, the default is always utf-8.
+	r = enc_locale();
+#else
 	// Use the default encoding as it's found by set_init_1().
 	r = get_encoding_default();
+#endif
 	if (r == NULL)
 	    r = (char_u *)ENC_DFLT;
 	return vim_strsave(r);