diff --git a/examples/HWA/makefile b/examples/HWA/makefile
index 0f22a74..e469b7f 100644
--- a/examples/HWA/makefile
+++ b/examples/HWA/makefile
@@ -1,9 +1,11 @@
 all: main
 
-main: ../../std.o
-	fasm main.asm
+main: ../../std.o main.o
 	ld -m elf_i386 main.o ../../std.o --output main
 
+main.o:
+	fasm main.asm
+
 ../../std.o:
 	make -C ../../ std.o
 
diff --git a/examples/file/main b/examples/file/main
index 2ce060e..3c10d90 100644
Binary files a/examples/file/main and b/examples/file/main differ
diff --git a/examples/file/main.asm b/examples/file/main.asm
index c1f3e9e..9bdee99 100644
--- a/examples/file/main.asm
+++ b/examples/file/main.asm
@@ -8,9 +8,14 @@ extrn print.str
 extrn print.nl
 extrn exit
 
+macro nl {
+	call print.nl
+}
+
 
 section '.strtab'
 filename db "makefile", 0
+error db "An error occurred while opening the file", 0
 
 
 section '.bss' writeable
@@ -22,17 +27,26 @@ _start:
 	push filename
 	call file.open
 	pop eax
+
+	cmp eax, 0
+	jne @f
+		push error
+		call print.str
+		nl
+		call exit
+
+	@@:
 	mov [file_], eax
 	
 	push dword [file_]
 	call print.str
-	call print.nl
-	call print.nl
+	nl
+	nl
 
 	push dword [file_]
 	call file.content
 	call print.str
-	call print.nl
+	nl
 
 	push dword [file_]
 	call file.close
diff --git a/examples/file/main.o b/examples/file/main.o
index 8691127..339c0e4 100644
Binary files a/examples/file/main.o and b/examples/file/main.o differ
diff --git a/examples/file/makefile b/examples/file/makefile
index 1e9b309..270ac57 100644
--- a/examples/file/makefile
+++ b/examples/file/makefile
@@ -1,8 +1,10 @@
 all: main
 
-main: ../../file.o ../../std.o ../../path.o ../../string.o
+main: ../../file.o ../../std.o ../../path.o ../../string.o main.o
+	ld -m elf_i386 main.o ../../file.o ../../std.o ../../path.o ../../string.o --output main
+
+main.o:
 	fasm main.asm
-	ld -m elf_i386 main.o ../../file.o ../../std.o ../../path.o --output main
 
 ../../std.o:
 	make -C ../.. std.o
diff --git a/examples/network/makefile b/examples/network/makefile
index 2973666..b73a1df 100644
--- a/examples/network/makefile
+++ b/examples/network/makefile
@@ -1,9 +1,11 @@
 all: main
 
-main: ../../std.o ../../string.o ../../network.o ../../dns.o ../../dnstoys.o
-	fasm main.asm
+main: ../../std.o ../../string.o ../../network.o ../../dns.o ../../dnstoys.o main.o
 	ld -m elf_i386 main.o ../../std.o ../../string.o ../../network.o ../../dns.o  ../../dnstoys.o --output main
 	
+main.o:
+	fasm main.asm
+
 ../../std.o:
 	make -C ../.. std.o
 
@@ -21,4 +23,3 @@ main: ../../std.o ../../string.o ../../network.o ../../dns.o ../../dnstoys.o
 	
 clear:
 	rm main.o main
-
diff --git a/file.o b/file.o
index 5e89213..c0392e7 100644
Binary files a/file.o and b/file.o differ
diff --git a/src/file.asm b/src/file.asm
index b80476e..43427cd 100644
--- a/src/file.asm
+++ b/src/file.asm
@@ -34,6 +34,13 @@ open:
 	mov edx, O_DIRECTORY
 	int 80h
 
+	cmp eax, -2
+	jne @f
+		mov [ebp+2*4], dword 0
+		postlude  
+		ret
+
+	@@:
 	mov [fd], eax
 
 	; fstat