diff --git a/ase/include/ase/cmn/fio.h b/ase/include/ase/cmn/fio.h
index 8f7261b1..0d33f183 100644
--- a/ase/include/ase/cmn/fio.h
+++ b/ase/include/ase/cmn/fio.h
@@ -15,10 +15,11 @@ enum ase_fio_open_flag_t
 
 	ASE_FIO_READ      = (1 << 1),
 	ASE_FIO_WRITE     = (1 << 2),
-	ASE_FIO_CREATE    = (1 << 3),
-	ASE_FIO_TRUNCATE  = (1 << 4),
-	ASE_FIO_EXCLUSIVE = (1 << 5),
-	ASE_FIO_APPEND    = (1 << 6),
+	ASE_FIO_APPEND    = (1 << 3),
+
+	ASE_FIO_CREATE    = (1 << 4),
+	ASE_FIO_TRUNCATE  = (1 << 5),
+	ASE_FIO_EXCLUSIVE = (1 << 6),
 	ASE_FIO_SYNC      = (1 << 7),
 
 	/* for ms windows only */
@@ -60,6 +61,14 @@ struct ase_fio_t
 extern "C" {
 #endif
 
+/****f* ase.fio/ase_fio_open
+ * NAME
+ *  ase_fio_open - open a file
+ *
+ * PARAMETERS
+ * 
+ * SYNOPSIS
+ */
 ase_fio_t* ase_fio_open (
 	ase_mmgr_t* mmgr,
 	ase_size_t ext,
@@ -67,6 +76,7 @@ ase_fio_t* ase_fio_open (
 	int flags,
 	int mode
 );
+/******/
 
 void ase_fio_close (
 	ase_fio_t* fio
diff --git a/ase/include/ase/cmn/sio.h b/ase/include/ase/cmn/sio.h
index 14ef240d..7e267407 100644
--- a/ase/include/ase/cmn/sio.h
+++ b/ase/include/ase/cmn/sio.h
@@ -16,10 +16,11 @@ enum ase_sio_open_flag_t
 
         ASE_SIO_READ      = ASE_FIO_READ,
         ASE_SIO_WRITE     = ASE_FIO_WRITE,
+	ASE_SIO_APPEND    = ASE_FIO_APPEND,
+
 	ASE_SIO_CREATE    = ASE_FIO_CREATE,
         ASE_SIO_TRUNCATE  = ASE_FIO_TRUNCATE,
 	ASE_SIO_EXCLUSIVE = ASE_FIO_EXCLUSIVE,
-	ASE_SIO_APPEND    = ASE_FIO_APPEND,
 	ASE_SIO_SYNC      = ASE_FIO_SYNC,
 
         ASE_SIO_NOSHRD    = ASE_FIO_NOSHRD,
diff --git a/ase/lib/cmn/fio.c b/ase/lib/cmn/fio.c
index 50fa2003..25eb0989 100644
--- a/ase/lib/cmn/fio.c
+++ b/ase/lib/cmn/fio.c
@@ -73,14 +73,19 @@ ase_fio_t* ase_fio_init (
 		DWORD creation_disposition = 0;
 		DWORD attributes = FILE_ATTRIBUTE_NORMAL;
 
-		if (flags & ASE_FIO_READ) desired_access |= GENERIC_READ;
-		if (flags & ASE_FIO_WRITE) desired_access |= GENERIC_WRITE;
 		if (flags & ASE_FIO_APPEND)  
 		{
 			/* this is not officialy documented for CreateFile.
 			 * ZwCreateFile (kernel) seems to document it */
 			desired_access |= FILE_APPEND_DATA;
 		}
+		else if (flags & ASE_FIO_WRITE)
+		{
+			/* In WIN32, FILE_APPEND_DATA and GENERIC_WRITE can't
+			 * be used together */
+			desired_access |= GENERIC_WRITE;
+		}
+		if (flags & ASE_FIO_READ) desired_access |= GENERIC_READ;
 	
 		if (flags & ASE_FIO_CREATE) 
 		{
@@ -132,13 +137,24 @@ ase_fio_t* ase_fio_init (
 		if (ase_wcstombs_strict (path, 
 			path_mb, ASE_COUNTOF(path_mb)) == -1) return ASE_NULL;
 	#endif
-
+		/*
+		 * rwa -> RDWR   | APPEND
+		 * ra  -> RDONLY | APPEND
+		 * wa  -> WRONLY | APPEND
+		 * a   -> WRONLY | APPEND
+		 */
 		if ((flags & ASE_FIO_READ) && 
 		    (flags & ASE_FIO_WRITE)) desired_access |= O_RDWR;
 		else if (flags & ASE_FIO_READ) desired_access |= O_RDONLY;
-		else desired_access |= O_WRONLY;
+		else if (flags & ASE_FIO_WRITE) desired_access |= O_WRONLY;
+
+		if (flags & ASE_FIO_APPEND) 
+		{
+			if (!(flags & ASE_FIO_READ) &&
+			    !(flags & ASE_FIO_WRITE)) desired_access |= O_WRONLY;
+			desired_access |= O_APPEND;
+		}
 
-		if (flags & ASE_FIO_APPEND) desired_access |= O_APPEND;
 		if (flags & ASE_FIO_CREATE) desired_access |= O_CREAT;
 		if (flags & ASE_FIO_TRUNCATE) desired_access |= O_TRUNC;
 		if (flags & ASE_FIO_EXCLUSIVE) desired_access |= O_EXCL;