diff --git a/windows/types_windows.go b/windows/types_windows.go
index 993a2297..358be3c7 100644
--- a/windows/types_windows.go
+++ b/windows/types_windows.go
@@ -65,6 +65,22 @@ var signals = [...]string{
 	15: "terminated",
 }
 
+// File flags for [os.OpenFile]. The O_ prefix is used to indicate
+// that these flags are specific to the OpenFile function.
+const (
+	O_FILE_FLAG_OPEN_NO_RECALL     = FILE_FLAG_OPEN_NO_RECALL
+	O_FILE_FLAG_OPEN_REPARSE_POINT = FILE_FLAG_OPEN_REPARSE_POINT
+	O_FILE_FLAG_SESSION_AWARE      = FILE_FLAG_SESSION_AWARE
+	O_FILE_FLAG_POSIX_SEMANTICS    = FILE_FLAG_POSIX_SEMANTICS
+	O_FILE_FLAG_BACKUP_SEMANTICS   = FILE_FLAG_BACKUP_SEMANTICS
+	O_FILE_FLAG_DELETE_ON_CLOSE    = FILE_FLAG_DELETE_ON_CLOSE
+	O_FILE_FLAG_SEQUENTIAL_SCAN    = FILE_FLAG_SEQUENTIAL_SCAN
+	O_FILE_FLAG_RANDOM_ACCESS      = FILE_FLAG_RANDOM_ACCESS
+	O_FILE_FLAG_NO_BUFFERING       = FILE_FLAG_NO_BUFFERING
+	O_FILE_FLAG_OVERLAPPED         = FILE_FLAG_OVERLAPPED
+	O_FILE_FLAG_WRITE_THROUGH      = FILE_FLAG_WRITE_THROUGH
+)
+
 const (
 	FILE_READ_DATA        = 0x00000001
 	FILE_READ_ATTRIBUTES  = 0x00000080