diff --git a/mysql-test/lib/My/Find.pm b/mysql-test/lib/My/Find.pm
index 36a08dd6b58..6b4d5732c36 100644
--- a/mysql-test/lib/My/Find.pm
+++ b/mysql-test/lib/My/Find.pm
@@ -23,14 +23,14 @@ package My::Find;
 
 use strict;
 use Carp;
+use My::Platform;
 
 use base qw(Exporter);
 our @EXPORT= qw(my_find_bin my_find_dir);
 
 our $vs_config_dir;
 
-my $is_win= ($^O eq "MSWin32" or $^O eq "cygwin");
-my $bin_extension= ".exe" if $is_win;
+my $bin_extension= ".exe" if IS_WINDOWS;
 
 #
 # my_find_bin - find an executable with "name_1...name_n" in
@@ -56,7 +56,7 @@ sub my_find_bin {
   # Find and return the first executable
   # -------------------------------------------------------
   foreach my $path (my_find_paths($base, $paths, $names, $bin_extension)) {
-    return $path if ( -x $path or ($is_win and -f $path) );
+    return $path if ( -x $path or (IS_WINDOWS and -f $path) );
   }
   find_error($base, $paths, $names);
 }
@@ -120,7 +120,7 @@ sub my_find_paths {
   # -------------------------------------------------------
   # Windows specific
   # -------------------------------------------------------
-  if ($is_win) {
+  if (IS_WINDOWS) {
     # Add the default extra build dirs unless a specific one has
     # already been selected
     push(@extra_dirs,
diff --git a/mysql-test/lib/My/Platform.pm b/mysql-test/lib/My/Platform.pm
new file mode 100644
index 00000000000..27543d55adf
--- /dev/null
+++ b/mysql-test/lib/My/Platform.pm
@@ -0,0 +1,95 @@
+# -*- cperl -*-
+# Copyright (C) 2004-2006 MySQL AB
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+package My::Platform;
+
+use strict;
+
+use base qw(Exporter);
+our @EXPORT= qw(IS_CYGWIN IS_WINDOWS IS_WIN32PERL
+		native_path posix_path mixed_path);
+
+BEGIN {
+  if ($^O eq "cygwin") {
+    # Make sure cygpath works
+    if ((system("cygpath > /dev/null 2>&1") >> 8) != 1){
+      die "Could not execute 'cygpath': $!";
+    }
+    eval 'sub IS_CYGWIN { 1 }';
+  }
+  else {
+    eval 'sub IS_CYGWIN { 0 }';
+  }
+  if ($^O eq "MSWin32") {
+    eval 'sub IS_WIN32PERL { 1 }';
+  }
+  else {
+    eval 'sub IS_WIN32PERL { 0 }';
+  }
+}
+
+BEGIN {
+  if (IS_CYGWIN or IS_WIN32PERL) {
+    eval 'sub IS_WINDOWS { 1 }';
+  }
+  else {
+    eval 'sub IS_WINDOWS { 0 }';
+  }
+}
+
+
+#
+# native_path
+# Convert from path format used by perl to the underlying
+# operating systems format
+#
+# NOTE
+#  Used when running windows binaries (that expect windows paths)
+#  in cygwin perl (that uses unix paths)
+#
+
+sub mixed_path {
+  my ($path)= @_;
+  if (IS_CYGWIN){
+    return unless defined $path;
+    $path= `cygpath -m $path`;
+    chomp $path;
+  }
+  return $path;
+}
+
+
+sub native_path {
+  my ($path)= @_;
+  $path=~ s/\//\\/g
+    if (IS_CYGWIN or IS_WIN32PERL);
+  return $path;
+}
+
+
+sub posix_path {
+  my ($path)= @_;
+  if (IS_CYGWIN){
+    return unless defined $path;
+    $path= `cygpath $path`;
+    chomp $path;
+  }
+  return $path;
+}
+
+
+
+1;
diff --git a/mysql-test/lib/My/SafeProcess.pm b/mysql-test/lib/My/SafeProcess.pm
index 8dffe66ea03..d4c3d29520a 100644
--- a/mysql-test/lib/My/SafeProcess.pm
+++ b/mysql-test/lib/My/SafeProcess.pm
@@ -56,35 +56,10 @@ use My::SafeProcess::Base;
 use base 'My::SafeProcess::Base';
 
 use My::Find;
+use My::Platform;
 
 my %running;
 
-BEGIN {
-  if ($^O eq "MSWin32") {
-    eval 'sub IS_WIN32PERL () { 1 }';
-  }
-  else {
-    eval 'sub IS_WIN32PERL () { 0 }';
-  }
-  if ($^O eq "cygwin") {
-    eval 'sub IS_CYGWIN () { 1 }';
-    # Make sure cygpath works
-    if ((system("cygpath > /dev/null 2>&1") >> 8) != 1){
-      die "Could not execute 'cygpath': $!";
-    }
-    eval 'sub fixpath {
-            my ($path)= @_;
-            return unless defined $path;
-            $path= `cygpath -w $path`;
-            chomp $path;
-            return $path;
-          }';
-  }
-  else {
-    eval 'sub IS_CYGWIN () { 0 }';
-  }
-}
-
 END {
   # Kill any children still running
   for my $proc (values %running){
@@ -163,12 +138,10 @@ sub new {
 #  }
 
   if (IS_CYGWIN){
-    # safe_procss is a windows program and need
-    # windows paths
-    $path= fixpath($path);
-    $input= fixpath($input);
-    $output= fixpath($output);
-    $error= fixpath($error);
+    $path= native_path($path);
+    $input= native_path($input);
+    $output= native_path($output);
+    $error= native_path($error);
   }
 
   my @safe_args;
diff --git a/mysql-test/lib/mtr_cases.pm b/mysql-test/lib/mtr_cases.pm
index 7bc3aad4b47..488ff21dabb 100644
--- a/mysql-test/lib/mtr_cases.pm
+++ b/mysql-test/lib/mtr_cases.pm
@@ -53,6 +53,7 @@ sub collect_option {
 use File::Basename;
 use IO::File();
 use My::Config;
+use My::Platform;
 
 require "mtr_match.pl";
 require "mtr_misc.pl";
@@ -744,7 +745,7 @@ sub collect_one_test_case {
   my $master_sh= "$testdir/$tname-master.sh";
   if ( -f $master_sh )
   {
-    if ( $main::is_win32_perl )
+    if ( IS_WIN32PERL )
     {
       $tinfo->{'skip'}= 1;
       $tinfo->{'comment'}= "No tests with sh scripts on Windows";
@@ -762,7 +763,7 @@ sub collect_one_test_case {
   my $slave_sh= "$testdir/$tname-slave.sh";
   if ( -f $slave_sh )
   {
-    if ( $main::is_win32_perl )
+    if ( IS_WIN32PERL )
     {
       $tinfo->{'skip'}= 1;
       $tinfo->{'comment'}= "No tests with sh scripts on Windows";
diff --git a/mysql-test/lib/mtr_misc.pl b/mysql-test/lib/mtr_misc.pl
index 759ad6da3bc..658eb270535 100644
--- a/mysql-test/lib/mtr_misc.pl
+++ b/mysql-test/lib/mtr_misc.pl
@@ -20,7 +20,8 @@
 
 use strict;
 
-sub mtr_native_path($);
+use My::Platform;
+
 sub mtr_init_args ($);
 sub mtr_add_arg ($$@);
 sub mtr_args2str($@);
@@ -30,27 +31,6 @@ sub mtr_file_exists(@);
 sub mtr_exe_exists(@);
 sub mtr_exe_maybe_exists(@);
 
-##############################################################################
-#
-#  Misc
-#
-##############################################################################
-
-# Convert path to OS native format
-sub mtr_native_path($)
-{
-  my $path= shift;
-
-  # MySQL version before 5.0 still use cygwin, no need
-  # to convert path
-  return $path
-    if ($::mysql_version_id < 50000);
-
-  $path=~ s/\//\\/g
-    if ($::is_win32);
-  return $path;
-}
-
 
 ##############################################################################
 #
@@ -70,14 +50,14 @@ sub mtr_add_arg ($$@) {
 
   # Quote args if args contain space
   $format= "\"$format\""
-    if ($::is_win32 and grep(/\s/, @fargs));
+    if (IS_WINDOWS and grep(/\s/, @fargs));
 
   push(@$args, sprintf($format, @fargs));
 }
 
 sub mtr_args2str($@) {
   my $exe=   shift or die;
-  return join(" ", mtr_native_path($exe), @_);
+  return join(" ", native_path($exe), @_);
 }
 
 ##############################################################################
@@ -109,7 +89,7 @@ sub mtr_path_exists (@) {
 sub mtr_script_exists (@) {
   foreach my $path ( @_ )
   {
-    if($::is_win32)
+    if(IS_WINDOWS)
     {
       return $path if -f $path;
     }
@@ -149,10 +129,10 @@ sub mtr_file_exists (@) {
 sub mtr_exe_maybe_exists (@) {
   my @path= @_;
 
-  map {$_.= ".exe"} @path if $::is_win32;
+  map {$_.= ".exe"} @path if IS_WINDOWS;
   foreach my $path ( @path )
   {
-    if($::is_win32)
+    if(IS_WINDOWS)
     {
       return $path if -f $path;
     }
diff --git a/mysql-test/lib/t/Platform.t b/mysql-test/lib/t/Platform.t
new file mode 100644
index 00000000000..a8cb7751925
--- /dev/null
+++ b/mysql-test/lib/t/Platform.t
@@ -0,0 +1,18 @@
+# -*- cperl -*-
+use Test::More qw(no_plan);
+use strict;
+
+use_ok ("My::Platform");
+use My::Platform;
+
+use File::Temp qw / tempdir /;
+my $dir = tempdir( CLEANUP => 1 );
+
+print "Running on Windows\n" if (IS_WINDOWS);
+print "Using ActiveState perl\n" if (IS_WIN32PERL);
+print "Using cygwin perl\n" if (IS_CYGWIN);
+
+print "dir: '$dir'\n";
+print "native: '".native_path($dir)."'\n";
+print "mixed: '".mixed_path($dir)."'\n";
+print "posix: '".posix_path($dir)."'\n";
diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index 12df5054891..0f18bd3dd65 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -43,16 +43,13 @@ use My::File::Path; # Patched version of File::Path
 use File::Basename;
 use File::Copy;
 use File::Temp qw / tempdir /;
+use My::Platform;
 use My::SafeProcess;
 use My::ConfigFactory;
 use My::Options;
 use mtr_cases;
 use mtr_report;
 
-our $is_win32_perl=  ($^O eq "MSWin32"); # ActiveState Win32 Perl
-our $is_cygwin=      ($^O eq "cygwin");  # Cygwin Perl
-our $is_win32=       ($is_win32_perl or $is_cygwin);
-
 require "lib/mtr_process.pl";
 require "lib/mtr_io.pl";
 require "lib/mtr_gcov.pl";
@@ -400,12 +397,11 @@ sub command_line_setup {
   }
 
   # Find the absolute path to the test directory
-  $glob_mysql_test_dir=  cwd();
-  if ( $is_cygwin )
+  $glob_mysql_test_dir= cwd();
+  if (IS_CYGWIN)
   {
-    # Windows programs like 'mysqld' needs Windows paths
-    $glob_mysql_test_dir= `cygpath -m "$glob_mysql_test_dir"`;
-    chomp($glob_mysql_test_dir);
+    # Use mixed path format i.e c:/path/to/
+    $glob_mysql_test_dir= mixed_path($glob_mysql_test_dir);
   }
 
   # In most cases, the base directory we find everything relative to,
@@ -568,7 +564,7 @@ sub command_line_setup {
     # Version 4.1 and --vardir was specified
     # Only supported as a symlink from var/
     # by setting up $opt_mem that symlink will be created
-    if ( ! $is_win32 )
+    if ( ! IS_WINDOWS )
     {
       # Only platforms that have native symlinks can use the vardir trick
       $opt_mem= $opt_vardir;
@@ -584,7 +580,7 @@ sub command_line_setup {
 
   # We make the path absolute, as the server will do a chdir() before usage
   unless ( $opt_vardir =~ m,^/, or
-           ($is_win32 and $opt_vardir =~ m,^[a-z]:/,i) )
+           (IS_WINDOWS and $opt_vardir =~ m,^[a-z]:/,i) )
   {
     # Make absolute path, relative test dir
     $opt_vardir= "$glob_mysql_test_dir/$opt_vardir";
@@ -620,16 +616,15 @@ sub command_line_setup {
   if ( $opt_embedded_server )
   {
     $opt_embedded_server= 1;
-    if ( $is_win32 )
+    if ( IS_WINDOWS )
     {
       # Add the location for libmysqld.dll to the path.
       my $separator= ";";
       my $lib_mysqld=
         mtr_path_exists(vs_config_dirs('libmysqld',''));
-      if ( $is_cygwin )
+      if ( IS_CYGWIN )
       {
-	$lib_mysqld= `cygpath "$lib_mysqld"`;
-	chomp($lib_mysqld);
+	$lib_mysqld= posix_path($lib_mysqld);
 	$separator= ":";
       }
       $ENV{'PATH'}= "$ENV{'PATH'}".$separator.$lib_mysqld;
@@ -802,7 +797,17 @@ sub collect_mysqld_features {
   #
   # --datadir must exist, mysqld will chdir into it
   #
-  my $list= `$exe_mysqld --no-defaults --datadir=$tmpdir --language=$path_language --skip-grant-tables --verbose --help`;
+  my $args;
+  mtr_init_args(\$args);
+  mtr_add_arg($args, "--no-defaults");
+  mtr_add_arg($args, "--datadir=%s", mixed_path($tmpdir));
+  mtr_add_arg($args, "--language=%s", $path_language);
+  mtr_add_arg($args, "--skip-grant-tables");
+  mtr_add_arg($args, "--verbose");
+  mtr_add_arg($args, "--help");
+
+  my $cmd= join(" ", $exe_mysqld, @$args);
+  my $list= `$cmd`;
 
   foreach my $line (split('\n', $list))
   {
@@ -964,7 +969,7 @@ sub client_debug_arg($$) {
 
 sub mysql_fix_arguments () {
 
-  return "" if ( $is_win32 );
+  return "" if ( IS_WINDOWS );
 
   my $exe=
     mtr_script_exists("$basedir/scripts/mysql_fix_privilege_tables",
@@ -1202,7 +1207,7 @@ sub environment_setup {
   $ENV{'MYSQL_BINLOG'}=             client_arguments("mysqlbinlog");
   $ENV{'MYSQL'}=                    client_arguments("mysql");
   $ENV{'MYSQL_UPGRADE'}=            client_arguments("mysql_upgrade");
-  $ENV{'MYSQLADMIN'}=               mtr_native_path($exe_mysqladmin);
+  $ENV{'MYSQLADMIN'}=               native_path($exe_mysqladmin);
   $ENV{'MYSQL_CLIENT_TEST'}=        mysql_client_test_arguments();
   $ENV{'MYSQL_FIX_SYSTEM_TABLES'}=  mysql_fix_arguments();
   $ENV{'EXE_MYSQL'}=                $exe_mysql;
@@ -1214,7 +1219,7 @@ sub environment_setup {
   my $exe_bug25714=
       mtr_exe_maybe_exists(vs_config_dirs('tests', 'bug25714'),
                            "$basedir/tests/bug25714");
-  $ENV{'MYSQL_BUG25714'}=  mtr_native_path($exe_bug25714);
+  $ENV{'MYSQL_BUG25714'}=  native_path($exe_bug25714);
 
   # ----------------------------------------------------
   # mysql_fix_privilege_tables.sql
@@ -1231,7 +1236,7 @@ sub environment_setup {
     mtr_exe_exists(vs_config_dirs('extra', 'my_print_defaults'),
 		   "$path_client_bindir/my_print_defaults",
 		   "$basedir/extra/my_print_defaults");
-  $ENV{'MYSQL_MY_PRINT_DEFAULTS'}= mtr_native_path($exe_my_print_defaults);
+  $ENV{'MYSQL_MY_PRINT_DEFAULTS'}= native_path($exe_my_print_defaults);
 
   # ----------------------------------------------------
   # perror
@@ -1239,7 +1244,7 @@ sub environment_setup {
   my $exe_perror= mtr_exe_exists(vs_config_dirs('extra', 'perror'),
 				 "$basedir/extra/perror",
 				 "$path_client_bindir/perror");
-  $ENV{'MY_PERROR'}= mtr_native_path($exe_perror);
+  $ENV{'MY_PERROR'}= native_path($exe_perror);
 
   # Create an environment variable to make it possible
   # to detect that valgrind is being used from test cases
@@ -1491,7 +1496,7 @@ sub vs_config_dirs ($$) {
   $exe = "" if not defined $exe;
 
   # Don't look in these dirs when not on windows
-  return () unless $is_win32;
+  return () unless IS_WINDOWS;
 
   if ($opt_vs_config)
   {
@@ -2614,7 +2619,7 @@ sub mysqld_arguments ($$$) {
   # When mysqld is run by a root user(euid is 0), it will fail
   # to start unless we specify what user to run as, see BUG#30630
   my $euid= $>;
-  if (!$is_win32 and $euid == 0 and
+  if (!IS_WINDOWS and $euid == 0 and
       (grep(/^--user/, @$extra_opts)) == 0) {
     mtr_add_arg($args, "%s--user=root", $prefix);
   }
@@ -2672,7 +2677,7 @@ sub mysqld_arguments ($$$) {
     mtr_add_arg($args, "%s%s", $prefix, "--core-file");
   }
 
-  if ( $is_win32 ){
+  if ( IS_WINDOWS ){
     mtr_add_arg($args, "%s--log-error=%s", $prefix, $mysqld->{"path_myerr"});
   }
 
@@ -3259,8 +3264,7 @@ sub start_mysqltest ($) {
   # ----------------------------------------------------------------------
   # export MYSQL_TEST variable containing <path>/mysqltest <args>
   # ----------------------------------------------------------------------
-  $ENV{'MYSQL_TEST'}=
-    mtr_native_path($exe_mysqltest) . " " . join(" ", @$args);
+  $ENV{'MYSQL_TEST'}= mtr_args2str($exe_mysqltest, @$args);
 
   # ----------------------------------------------------------------------
   # Add arguments that should not go into the MYSQL_TEST env var