--- blender-2.79/source/blender/imbuf/intern/dds/dds_api.cpp.orig	2017-09-14 15:29:21.477036100 +0300
+++ blender-2.79/source/blender/imbuf/intern/dds/dds_api.cpp	2017-09-14 15:29:30.667254000 +0300
@@ -59,7 +59,7 @@
   /* open file for writing */
   std::ofstream fildes;
 
-#if defined(WIN32)
+#if defined (_MSC_VER)
   wchar_t *wname = alloc_utf16_from_8(name, 0);
   fildes.open(wname);
   free(wname);
--- blender-2.79/source/blender/imbuf/intern/openexr/openexr_api.cpp.orig	2017-09-14 15:27:43.677657600 +0300
+++ blender-2.79/source/blender/imbuf/intern/openexr/openexr_api.cpp	2017-09-14 15:28:07.224301900 +0300
@@ -167,7 +167,7 @@
   IFileStream(const char *filename) : IStream(filename)
   {
     /* utf-8 file path support on windows */
-#if defined(WIN32)
+#if defined (_MSC_VER)
     wchar_t *wfilename = alloc_utf16_from_8(filename, 0);
     ifs.open(wfilename, std::ios_base::binary);
     free(wfilename);
@@ -273,7 +273,7 @@
   OFileStream(const char *filename) : OStream(filename)
   {
     /* utf-8 file path support on windows */
-#if defined(WIN32)
+#if defined (_MSC_VER)
     wchar_t *wfilename = alloc_utf16_from_8(filename, 0);
     ofs.open(wfilename, std::ios_base::binary);
     free(wfilename);