diff --git a/default.config b/default.config
index 2320bbc..d3abaad 100644
--- a/default.config
+++ b/default.config
@@ -16,10 +16,23 @@ SRC_CPP="$(  find src -name '*.cpp')"
 
 OUTDIR=bin
 OBJDIR=obj
-EXEC_FILE=$PROJECT.com
-SHARED_LIB_FILE=$PROJECT.so
 STATIC_LIB_FILE=$PROJECT.a
 
+case $OS in
+    WINDOWS)
+        EXEC_FILE=$PROJECT.exe
+        SHARED_LIB_FILE=$PROJECT.dll
+        ;;
+    LINUX)
+        EXEC_FILE=$PROJECT
+        SHARED_LIB_FILE=$PROJECT.so
+        ;;
+    *)
+        printf "${RED}operating system $OS has no configuration variants\n"
+        exit 1
+        ;;
+esac
+
 case $TASK in
     build_exec)
         C_ARGS="-O2"
@@ -75,14 +88,3 @@ case $TASK in
         TASK_SCRIPT=cbuild/default_tasks/valgrind.sh
         ;;
 esac
-
-case $OS in
-    WINDOWS)
-        ;;
-    LINUX)
-        ;;
-    *)
-        printf "${RED}operating system $OS has no configuration variants\n"
-        exit 1
-        ;;
-esac