Index: Source/NSData.m
===================================================================
--- Source/NSData.m	(revisión: 38334)
+++ Source/NSData.m	(copia de trabajo)
@@ -1357,6 +1357,16 @@
       int	desc;
       int	mask;
 
+#if defined(__MINGW__)
+      strncpy(wthePath, wtheRealPath, sizeof(wthePath) - 1);
+      wthePath[sizeof(wthePath) - 1] = '\0';
+      strncat(wthePath, "XXXXXX", 6);
+      if ((desc = mkstemp(wthePath)) < 0)
+	{
+          NSWarnMLog(@"mkstemp (%s) failed - %@", wthePath, [NSError _last]);
+          goto failure;
+	}
+#else
       strncpy(thePath, theRealPath, sizeof(thePath) - 1);
       thePath[sizeof(thePath) - 1] = '\0';
       strncat(thePath, "XXXXXX", 6);
@@ -1365,9 +1375,14 @@
           NSWarnMLog(@"mkstemp (%s) failed - %@", thePath, [NSError _last]);
           goto failure;
 	}
+#endif
       mask = umask(0);
       umask(mask);
+#if defined(__MINGW__)
+      chmod(wthePath, 0644 & ~mask);
+#else
       fchmod(desc, 0644 & ~mask);
+#endif
       if ((theFile = fdopen(desc, "w")) == 0)
 	{
 	  close(desc);
@@ -1375,9 +1390,15 @@
     }
   else
     {
+#if defined(__MINGW__)
+      strncpy(wthePath, wtheRealPath, sizeof(wthePath) - 1);
+      wthePath[sizeof(wthePath) - 1] = '\0';
+      theFile = fopen(wthePath, "wb");
+#else
       strncpy(thePath, theRealPath, sizeof(thePath) - 1);
       thePath[sizeof(thePath) - 1] = '\0';
       theFile = fopen(thePath, "wb");
+#endif
     }
 #else
   if (useAuxiliaryFile)