Fix utf16 encoded files handling on Windows

git-p4

@@ -8,7 +8,7 @@
 # License: MIT <http://www.opensource.org/licenses/mit-license.php>
 #
 
-import optparse, sys, os, marshal, subprocess, shlex
+import optparse, sys, os, marshal, subprocess, shlex, stat
 import tempfile, os.path, time, platform
 import re
 import cStringIO
@@ -780,10 +780,22 @@ class P4FileReader:
 
             if header['type'].startswith('utf16'):
                 # Don't even try to convert utf16. Ask p4 to write the file directly.
-                tmpFile = tempfile.NamedTemporaryFile()
-                P4Helper().p4_system("print -o \"%s\" \"%s\"" % (tmpFile.name, escapeStringP4(header['depotFile'])))
-                text = open(tmpFile.name).read()
-                tmpFile.close()
+
+                # Create temporary file and disable automatic removal to be able to close it.
+                # Closing is necessary because the p4 need to write some data into this file
+                # but Windows-based systems can not open an already opened temporary file
+                # created by NamedTemporaryFile function.
+                tmpFile = tempfile.NamedTemporaryFile(delete=False)
+                try:
+                    tmpFile.close()
+                    P4Helper().p4_system("print -o \"%s\" \"%s\"" % (tmpFile.name, escapeStringP4(header['depotFile'])))
+                    text = open(tmpFile.name).read()
+                finally:
+                    # The temporary file may become read-only after `p4 print`,
+                    # but os.remove requires write access.
+                    if not os.access(tmpFile.name, os.W_OK):
+                        os.chmod(tmpFile.name, stat.S_IWUSR)
+                    os.remove(tmpFile.name)
             else:
                 text = textBuffer.getvalue()
             textBuffer.close()