diff --git a/examples/dwebp.c b/examples/dwebp.c
index a37b05ed..fe80dfe3 100644
--- a/examples/dwebp.c
+++ b/examples/dwebp.c
@@ -38,11 +38,6 @@
 #include <wincodec.h>
 #endif
 
-#if defined(_WIN32)
-#include <fcntl.h>   // for _O_BINARY
-#include <io.h>      // for _setmode()
-#endif
-
 #include "webp/decode.h"
 #include "./example_util.h"
 #include "./stopwatch.h"
@@ -482,15 +477,8 @@ static int SaveOutput(const WebPDecBuffer* const buffer,
   needs_open_file = (format != PNG);
 #endif
 
-#if defined(_WIN32)
-  if (use_stdout && _setmode(_fileno(stdout), _O_BINARY) == -1) {
-    fprintf(stderr, "Failed to reopen stdout in O_BINARY mode.\n");
-    return -1;
-  }
-#endif
-
   if (needs_open_file) {
-    fout = use_stdout ? stdout : fopen(out_file, "wb");
+    fout = use_stdout ? ExUtilSetBinaryMode(stdout) : fopen(out_file, "wb");
     if (fout == NULL) {
       fprintf(stderr, "Error opening output file %s\n", out_file);
       return 0;
diff --git a/examples/example_util.c b/examples/example_util.c
index b77b816a..4443f83d 100644
--- a/examples/example_util.c
+++ b/examples/example_util.c
@@ -11,6 +11,11 @@
 //
 
 #include "./example_util.h"
+
+#if defined(_WIN32)
+#include <fcntl.h>   // for _O_BINARY
+#include <io.h>      // for _setmode()
+#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -21,9 +26,18 @@
 // -----------------------------------------------------------------------------
 // File I/O
 
-static const size_t kBlockSize = 16384;  // default initial size
+FILE* ExUtilSetBinaryMode(FILE* file) {
+#if defined(_WIN32)
+  if (_setmode(_fileno(file), _O_BINARY) == -1) {
+    fprintf(stderr, "Failed to reopen file in O_BINARY mode.\n");
+    return NULL;
+  }
+#endif
+  return file;
+}
 
 int ExUtilReadFromStdin(const uint8_t** data, size_t* data_size) {
+  static const size_t kBlockSize = 16384;  // default initial size
   size_t max_size = 0;
   size_t size = 0;
   uint8_t* input = NULL;
diff --git a/examples/example_util.h b/examples/example_util.h
index bf90c35d..4ef703da 100644
--- a/examples/example_util.h
+++ b/examples/example_util.h
@@ -13,12 +13,17 @@
 #ifndef WEBP_EXAMPLES_EXAMPLE_UTIL_H_
 #define WEBP_EXAMPLES_EXAMPLE_UTIL_H_
 
+#include <stdio.h>
 #include "webp/decode.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+// Reopen file in binary (O_BINARY) mode.
+// Returns 'file' on success, NULL otherwise.
+FILE* ExUtilSetBinaryMode(FILE* file);
+
 // Allocates storage for entire file 'file_name' and returns contents and size
 // in 'data' and 'data_size'. Returns 1 on success, 0 otherwise. '*data' should
 // be deleted using free().