diff --git a/engine/joint/v4k.h b/engine/joint/v4k.h
index 9896071..b8bd187 100644
--- a/engine/joint/v4k.h
+++ b/engine/joint/v4k.h
@@ -31598,7 +31598,7 @@ int gladLoadGL( GLADloadfunc load) {
 #if defined __TINYC__ && defined _WIN32
 #define MAPVK_VSC_TO_VK 1
 #define MAPVK_VK_TO_VSC 0
-#define IPV6_V6ONLY 0
+#define IPV6_V6ONLY 27
 #define _WIN32_WINNT_VISTA 0
 #define _WIN32_WINNT_WINXP 0
 #define _WIN32_WINNT_WIN7 0
@@ -345565,7 +345565,7 @@ const char * app_exec( const char *cmd ) {
 }
 
 void app_spawn( const char *cmd ) {
-    if( !cmd[0] ) return "0               ";
+    if( !cmd[0] ) return;
     cmd = file_normalize(cmd);
 
     system(cmd);
diff --git a/engine/split/v4k.x.inl b/engine/split/v4k.x.inl
index 09c7cb9..c25f8f4 100644
--- a/engine/split/v4k.x.inl
+++ b/engine/split/v4k.x.inl
@@ -62,7 +62,7 @@
 #if defined __TINYC__ && defined _WIN32
 #define MAPVK_VSC_TO_VK 1
 #define MAPVK_VK_TO_VSC 0
-#define IPV6_V6ONLY 0
+#define IPV6_V6ONLY 27
 #define _WIN32_WINNT_VISTA 0
 #define _WIN32_WINNT_WINXP 0
 #define _WIN32_WINNT_WIN7 0
diff --git a/engine/split/v4k_system.c b/engine/split/v4k_system.c
index dc9208e..e6712fc 100644
--- a/engine/split/v4k_system.c
+++ b/engine/split/v4k_system.c
@@ -107,7 +107,7 @@ const char * app_exec( const char *cmd ) {
 }
 
 void app_spawn( const char *cmd ) {
-    if( !cmd[0] ) return "0               ";
+    if( !cmd[0] ) return;
     cmd = file_normalize(cmd);
 
     system(cmd);
diff --git a/engine/v4k b/engine/v4k
index 38eb774..d864bf7 100644
--- a/engine/v4k
+++ b/engine/v4k
@@ -13974,7 +13974,7 @@ int gladLoadGL( GLADloadfunc load) {
 #if defined __TINYC__ && defined _WIN32
 #define MAPVK_VSC_TO_VK 1
 #define MAPVK_VK_TO_VSC 0
-#define IPV6_V6ONLY 0
+#define IPV6_V6ONLY 27
 #define _WIN32_WINNT_VISTA 0
 #define _WIN32_WINNT_WINXP 0
 #define _WIN32_WINNT_WIN7 0
diff --git a/engine/v4k.c b/engine/v4k.c
index e37cbba..0f17309 100644
--- a/engine/v4k.c
+++ b/engine/v4k.c
@@ -16260,7 +16260,7 @@ const char * app_exec( const char *cmd ) {
 }
 
 void app_spawn( const char *cmd ) {
-    if( !cmd[0] ) return "0               ";
+    if( !cmd[0] ) return;
     cmd = file_normalize(cmd);
 
     system(cmd);