diff --git a/texk/seetexk/ChangeLog b/texk/seetexk/ChangeLog
index 82993f8d87..839cc1b19f 100644
--- a/texk/seetexk/ChangeLog
+++ b/texk/seetexk/ChangeLog
@@ -1,3 +1,9 @@
+2023-07-05  TANAKA Takuji  <ttk@t-lab.opal.ne.jp>
+
+	* dvibook.c, dviconcat.c, dviselect.c, dvitodvi.c:
+	Skip Unicode conversion if command line arguments are missing
+	in order to prevent unwanted looking for texmf.cnf. (Windows only)
+
 2020-09-13  TANAKA Takuji  <ttk@t-lab.opal.ne.jp>
 
 	* configure.ac: SeeTeX Ver.20200908
diff --git a/texk/seetexk/dvibook.c b/texk/seetexk/dvibook.c
index 47e51efcae..cee048731f 100644
--- a/texk/seetexk/dvibook.c
+++ b/texk/seetexk/dvibook.c
@@ -404,11 +404,13 @@ main(int argc, char **argv)
 	int ac;
 	char **av, *enc;
 
-	kpse_set_program_name(argv[0], "dvibook");
-	enc = kpse_var_value("command_line_encoding");
-	if (get_command_line_args_utf8(enc, &ac, &av)) {
-		argc = ac;
-		argv = av;
+	if (argc>1) {
+		kpse_set_program_name(argv[0], "dvibook");
+		enc = kpse_var_value("command_line_encoding");
+		if (get_command_line_args_utf8(enc, &ac, &av)) {
+			argc = ac;
+			argv = av;
+		}
 	}
 #endif
 
diff --git a/texk/seetexk/dviconcat.c b/texk/seetexk/dviconcat.c
index 0184829e60..18e3c14c89 100644
--- a/texk/seetexk/dviconcat.c
+++ b/texk/seetexk/dviconcat.c
@@ -404,11 +404,13 @@ main(int argc, char **argv)
 	int ac;
 	char **av, *enc;
 
-	kpse_set_program_name(argv[0], "dviconcat");
-	enc = kpse_var_value("command_line_encoding");
-	if (get_command_line_args_utf8(enc, &ac, &av)) {
-		argc = ac;
-		argv = av;
+	if (argc>1) {
+		kpse_set_program_name(argv[0], "dviconcat");
+		enc = kpse_var_value("command_line_encoding");
+		if (get_command_line_args_utf8(enc, &ac, &av)) {
+			argc = ac;
+			argv = av;
+		}
 	}
 #endif
 
diff --git a/texk/seetexk/dviselect.c b/texk/seetexk/dviselect.c
index 10caa2f820..99428a2caf 100644
--- a/texk/seetexk/dviselect.c
+++ b/texk/seetexk/dviselect.c
@@ -535,11 +535,13 @@ main(int argc, char **argv)
 	int ac;
 	char **av, *enc;
 
-	kpse_set_program_name(argv[0], "dviselect");
-	enc = kpse_var_value("command_line_encoding");
-	if (get_command_line_args_utf8(enc, &ac, &av)) {
-		argc = ac;
-		argv = av;
+	if (argc>1) {
+		kpse_set_program_name(argv[0], "dviselect");
+		enc = kpse_var_value("command_line_encoding");
+		if (get_command_line_args_utf8(enc, &ac, &av)) {
+			argc = ac;
+			argv = av;
+		}
 	}
 #endif
 
diff --git a/texk/seetexk/dvitodvi.c b/texk/seetexk/dvitodvi.c
index 637f4731cf..316892635b 100644
--- a/texk/seetexk/dvitodvi.c
+++ b/texk/seetexk/dvitodvi.c
@@ -628,11 +628,13 @@ main(int argc, char **argv)
 	int ac;
 	char **av, *enc;
 
-	kpse_set_program_name(argv[0], "dvitodvi");
-	enc = kpse_var_value("command_line_encoding");
-	if (get_command_line_args_utf8(enc, &ac, &av)) {
-		argc = ac;
-		argv = av;
+	if (argc>1) {
+		kpse_set_program_name(argv[0], "dvitodvi");
+		enc = kpse_var_value("command_line_encoding");
+		if (get_command_line_args_utf8(enc, &ac, &av)) {
+			argc = ac;
+			argv = av;
+		}
 	}
 #endif