diff --git a/SMILEBASIC/data.d b/SMILEBASIC/data.d
new file mode 100644
index 0000000..878bfea
--- /dev/null
+++ b/SMILEBASIC/data.d
@@ -0,0 +1,19 @@
+module otya.smilebasic.data;
+
+enum DataType : byte
+{
+    ushort_,
+    int_,
+    double_
+}
+
+align(1) struct DataHeader
+{
+    char[8] magic;//PCBN0001
+    DataType type;
+    byte dimension;
+    int dim1;
+    int dim2;
+    int dim3;
+    int dim4;
+}
diff --git a/dub.json b/dub.json
index 84a07ac..ce247d6 100644
--- a/dub.json
+++ b/dub.json
@@ -4,7 +4,7 @@
 		"derelict-sdl2": "~>1.9.7",
 		"derelict-gl3": "*"
 	},
-	"sourceFiles": ["SMILEBASIC/bg.d","SMILEBASIC/builtinfunctions.d","SMILEBASIC/compiler.d","SMILEBASIC/error.d","SMILEBASIC/main.d","SMILEBASIC/node.d","SMILEBASIC/parser.d","SMILEBASIC/petitcomputer.d","SMILEBASIC/sprite.d","SMILEBASIC/systemvariable.d","SMILEBASIC/token.d","SMILEBASIC/type.d","SMILEBASIC/VM.d","SMILEBASIC/project.d","SMILEBASIC/console.d","SMILEBASIC/graphic.d","SMILEBASIC/dialog.d"],
+	"sourceFiles": ["SMILEBASIC/bg.d","SMILEBASIC/builtinfunctions.d","SMILEBASIC/compiler.d","SMILEBASIC/error.d","SMILEBASIC/main.d","SMILEBASIC/node.d","SMILEBASIC/parser.d","SMILEBASIC/petitcomputer.d","SMILEBASIC/sprite.d","SMILEBASIC/systemvariable.d","SMILEBASIC/token.d","SMILEBASIC/type.d","SMILEBASIC/VM.d","SMILEBASIC/project.d","SMILEBASIC/console.d","SMILEBASIC/graphic.d","SMILEBASIC/dialog.d","SMILEBASIC/data.d"],
 	"targetType": "executable",
 	"buildRequirements": ["allowWarnings"],
 	"targetPath": "out",