diff --git a/config.h b/config.h
new file mode 100644
index 0000000..58321bf
--- /dev/null
+++ b/config.h
@@ -0,0 +1,7 @@
+#include "defines.h"
+
+
+static file_preview file_previews[] = {
+	{ "c", "&a" },
+	{ ".c", "&ueberzug" },
+};
diff --git a/defines.h b/defines.h
index 25d16db..5bc867f 100644
--- a/defines.h
+++ b/defines.h
@@ -1,3 +1,8 @@
+#ifndef CONFIG_GUARD
+#define CONFIG_GUARD
+#include "config.h" 
+#endif
+
 #define STATUS_QUIT_PROGRAM 1
 #define STATUS_RUN_BACKEND 2
 #define STATUS_RELOAD_DIRECTORY 4
@@ -21,6 +26,7 @@
 #define FILE_STATUS_HOVER 1
 #define FILE_STATUS_SELECTED 2;
 #define FILE_STATUS_IS_REGULAR_FILE 4
+#define FILE_STATUS_FILE_OPEN 128 /* only used for file previews */
 
 #define COLOR_UNKNOWN 0
 #define COLOR_DIR 1
@@ -44,9 +50,10 @@
 #define FILE_TYPE_SOCK COLOR_SOCK
 #define FILE_TYPE_FIFO COLOR_FIFO
 #define FILE_TYPE_ORPHAN COLOR_ORPHAN
+#define FILE_TYPE_OPEN_FILE 128 /* this is only used in rgt_content to print a file preview, not the dir */
 
-#ifndef GUARD
-#define GUARD
+#ifndef STRUCT_GUARD
+#define STRUCT_GUARD
 
 /* complex types are good actually */
 typedef struct File {
@@ -61,5 +68,11 @@ typedef struct Color {
 	char *file_extension;
 	short color_pair;
 } color;
+typedef struct File_preview {
+	char *file_extension;
+	char *command; /* this will blindly execute any inserted shell command */
+			/* commands with an '&' prefix are inbuild */
+} file_preview;
+	
 
 #endif