diff --git a/src/com/annimon/ownlang/lib/modules/files.java b/src/com/annimon/ownlang/lib/modules/files.java
index 979c399..2fdffc4 100644
--- a/src/com/annimon/ownlang/lib/modules/files.java
+++ b/src/com/annimon/ownlang/lib/modules/files.java
@@ -31,6 +31,12 @@ public final class files implements Module {
         
         Functions.set("fopen", new fopen());
         Functions.set("listFiles", new listFiles());
+        Functions.set("delete", new delete());
+        Functions.set("exists", new exists());
+        Functions.set("isDirectory", new isDirectory());
+        Functions.set("isFile", new isFile());
+        Functions.set("mkdir", new mkdir());
+        Functions.set("fileSize", new fileSize());
         Functions.set("readBoolean", new readBoolean());
         Functions.set("readByte", new readByte());
         Functions.set("readBytes", new readBytes());
@@ -128,6 +134,48 @@ public final class files implements Module {
         }
     }
     
+    private static class delete extends FileFunction {
+        @Override
+        protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {
+            return NumberValue.fromBoolean(fileInfo.file.delete());
+        }
+    }
+    
+    private static class exists extends FileFunction {
+        @Override
+        protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {
+            return NumberValue.fromBoolean(fileInfo.file.exists());
+        }
+    }
+    
+    private static class isDirectory extends FileFunction {
+        @Override
+        protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {
+            return NumberValue.fromBoolean(fileInfo.file.isDirectory());
+        }
+    }
+    
+    private static class isFile extends FileFunction {
+        @Override
+        protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {
+            return NumberValue.fromBoolean(fileInfo.file.isFile());
+        }
+    }
+    
+    private static class mkdir extends FileFunction {
+        @Override
+        protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {
+            return NumberValue.fromBoolean(fileInfo.file.mkdir());
+        }
+    }
+    
+    private static class fileSize extends FileFunction {
+        @Override
+        protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {
+            return new NumberValue(fileInfo.file.length());
+        }
+    }
+    
     private static class readBoolean extends FileFunction {
         @Override
         protected Value execute(FileInfo fileInfo, Value[] args) throws IOException {