diff --git a/toolbox/os.cpp b/toolbox/os.cpp
index 6179073..30b895e 100644
--- a/toolbox/os.cpp
+++ b/toolbox/os.cpp
@@ -203,6 +203,8 @@ namespace OS
 			case 'i':
 				if (ext == "i") // asmiigs include file
 					return true;
+				if (ext == "inc")
+					return true;
 				break;
 
 			case 'h':