diff --git a/configure.ac b/configure.ac
index 444e86224..64f986ca3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -407,7 +407,7 @@ case $host_os in
      have_msw="yes"
      CXXFLAGS="$CXXFLAGS -mms-bitfields -mwin32 -mwindows"
      CPPFLAGS="$CPPFLAGS -DWIN32 -D_WIN32 -DWIN32_LEAN_AND_MEAN"
-     LIBS="$LIBS -lshell32 -lws2_32"
+     LIBS="$LIBS -liphlpapi -lshell32 -lws2_32"
      transmissionlocaledir="locale"
      if test -z "$host_alias"; then
        hostaliaswindres=
diff --git a/libtransmission/bencode.c b/libtransmission/bencode.c
index 35d24ef4f..1e8e9d9bf 100644
--- a/libtransmission/bencode.c
+++ b/libtransmission/bencode.c
@@ -18,9 +18,10 @@
 #include <stdlib.h> /* realpath() */
 #include <string.h>
 
-#ifdef WIN32
+#ifdef WIN32 /* tr_mkstemp() */
  #include <fcntl.h>
- #define fsync(fd) _commit(fd)
+ #define _S_IREAD 256
+ #define _S_IWRITE 128
 #endif
 
 #include <sys/types.h> /* stat() */
@@ -1633,6 +1634,31 @@ tr_bencToStr( const tr_benc * top, tr_fmt_mode mode, int * len )
     return ret;
 }
 
+/* portability wrapper for mkstemp(). */
+static int
+tr_mkstemp( char * template )
+{
+#ifdef WIN32
+    const int flags = O_RDWR | O_BINARY | O_CREAT | O_EXCL | _O_SHORT_LIVED;
+    const mode_t mode = _S_IREAD | _S_IWRITE;
+    mktemp( template );
+    return open( template, flags, mode );
+#else
+    return mkstemp( template );
+#endif
+}
+
+/* portability wrapper for fsync(). */
+static void
+tr_fsync( int fd )
+{
+#ifdef WIN32
+    _commit( fd );
+#else
+    fsync( fd );
+#endif
+}
+
 int
 tr_bencToFile( const tr_benc * top, tr_fmt_mode mode, const char * filename )
 {
@@ -1642,13 +1668,13 @@ tr_bencToFile( const tr_benc * top, tr_fmt_mode mode, const char * filename )
     char buf[TR_PATH_MAX];
 
     /* follow symlinks to find the "real" file, to make sure the temporary
-     * we build with mkstemp() is created on the right partition */
+     * we build with tr_mkstemp() is created on the right partition */
     if( tr_realpath( filename, buf ) != NULL )
         filename = buf;
 
     /* if the file already exists, try to move it out of the way & keep it as a backup */
     tmp = tr_strdup_printf( "%s.tmp.XXXXXX", filename );
-    fd = mkstemp( tmp );
+    fd = tr_mkstemp( tmp );
     if( fd >= 0 )
     {
         int len;
@@ -1657,7 +1683,7 @@ tr_bencToFile( const tr_benc * top, tr_fmt_mode mode, const char * filename )
 
         if( write( fd, str, len ) == (ssize_t)len )
         {
-            fsync( fd );
+            tr_fsync( fd );
             close( fd );
 
             if( !unlink( filename ) || ( errno == ENOENT ) )
@@ -1728,3 +1754,4 @@ tr_bencLoadFile( tr_benc * setme, tr_fmt_mode mode, const char * filename )
     tr_free( content );
     return err;
 }
+
diff --git a/libtransmission/blocklist.c b/libtransmission/blocklist.c
index cb7eaa5a5..ae2c00d01 100644
--- a/libtransmission/blocklist.c
+++ b/libtransmission/blocklist.c
@@ -15,6 +15,8 @@
 #include <string.h>
 
 #ifdef WIN32
+ #include <w32api.h>
+ #define WINVER  WindowsXP
  #include <windows.h>
 #endif
 
@@ -33,6 +35,10 @@
 #include "net.h"
 #include "utils.h"
 
+#ifndef O_BINARY
+ #define O_BINARY 0
+#endif
+
 
 /***
 ****  PRIVATE
@@ -80,18 +86,14 @@ blocklistLoad( tr_blocklist * b )
     if( stat( b->filename, &st ) == -1 )
         return;
 
-    fd = open( b->filename, O_RDONLY );
+    fd = open( b->filename, O_RDONLY | O_BINARY );
     if( fd == -1 )
     {
         tr_err( err_fmt, b->filename, tr_strerror( errno ) );
         return;
     }
 
-#ifndef WIN32
     b->rules = mmap( NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0 );
-#else
-    b->rules = mmap( NULL, st.st_size, 0, 0, fd, 0 );
-#endif
     if( !b->rules )
     {
         tr_err( err_fmt, b->filename, tr_strerror( errno ) );
@@ -315,7 +317,7 @@ _tr_blocklistSetContent( tr_blocklist * b,
         return 0;
     }
 
-    in = fopen( filename, "r" );
+    in = fopen( filename, "rb" );
     if( !in )
     {
         tr_err( err_fmt, filename, tr_strerror( errno ) );
@@ -362,7 +364,7 @@ _tr_blocklistSetContent( tr_blocklist * b,
 
     {
         char * base = tr_basename( b->filename );
-        tr_inf( _( "Blocklist \"%1$s\" updated with %2$'d entries" ), base, outCount );
+        tr_inf( _( "Blocklist \"%s\" updated with %'d entries" ), base, outCount );
         tr_free( base );
     }
 
diff --git a/libtransmission/net.c b/libtransmission/net.c
index d3a18d131..eccb673e2 100644
--- a/libtransmission/net.c
+++ b/libtransmission/net.c
@@ -32,8 +32,8 @@
 #include <sys/types.h>
 
 #ifdef WIN32
- #include <winsock2.h> /* inet_addr */
- #include <WS2tcpip.h>
+ #define _WIN32_WINNT   0x0501
+ #include <ws2tcpip.h>
 #else
  #include <sys/socket.h>
  #include <netinet/in.h>
diff --git a/libtransmission/net.h b/libtransmission/net.h
index 835ddeff8..286ae9b99 100644
--- a/libtransmission/net.h
+++ b/libtransmission/net.h
@@ -31,9 +31,7 @@
 
 #ifdef WIN32
  #include <inttypes.h>
- #include <winsock2.h>
- #include <WS2tcpip.h>
- typedef int socklen_t;
+ #include <ws2tcpip.h>
 #else
  #include <sys/types.h>
  #include <sys/socket.h>
@@ -42,6 +40,7 @@
 #endif
 
 #ifdef WIN32
+ #define EADDRINUSE              WSAEADDRINUSE
  #define ECONNREFUSED            WSAECONNREFUSED
  #define ECONNRESET              WSAECONNRESET
  #define EHOSTUNREACH            WSAEHOSTUNREACH
diff --git a/libtransmission/torrent.c b/libtransmission/torrent.c
index 77a9df79b..b10a33df6 100644
--- a/libtransmission/torrent.c
+++ b/libtransmission/torrent.c
@@ -1658,6 +1658,15 @@ tr_torrentClearRatioLimitHitCallback( tr_torrent * torrent )
     tr_torrentSetRatioLimitHitCallback( torrent, NULL, NULL );
 }
 
+static void
+tr_setenv( const char * name, const char * value, tr_bool override )
+{
+#ifdef WIN32
+    putenv( tr_strdup_printf( "%s=%s", name, value ) ); /* leaks memory... */
+#else
+    setenv( name, value, override );
+#endif
+}
 
 static void
 torrentCallScript( tr_torrent * tor, const char * script )
@@ -1673,16 +1682,16 @@ torrentCallScript( tr_torrent * tor, const char * script )
         clearenv( );
 #endif
 
-        setenv( "TR_APP_VERSION", SHORT_VERSION_STRING, 1 );
+        tr_setenv( "TR_APP_VERSION", SHORT_VERSION_STRING, 1 );
 
         tr_snprintf( buf, sizeof( buf ), "%d", tr_torrentId( tor ) );
-        setenv( "TR_TORRENT_ID", buf, 1 );
-        setenv( "TR_TORRENT_NAME", tr_torrentName( tor ), 1 );
-        setenv( "TR_TORRENT_DIR", tor->currentDir, 1 );
-        setenv( "TR_TORRENT_HASH", tor->info.hashString, 1 );
+        tr_setenv( "TR_TORRENT_ID", buf, 1 );
+        tr_setenv( "TR_TORRENT_NAME", tr_torrentName( tor ), 1 );
+        tr_setenv( "TR_TORRENT_DIR", tor->currentDir, 1 );
+        tr_setenv( "TR_TORRENT_HASH", tor->info.hashString, 1 );
         tr_strlcpy( buf, ctime( &now ), sizeof( buf ) );
         *strchr( buf,'\n' ) = '\0';
-        setenv( "TR_TIME_LOCALTIME", buf, 1 );
+        tr_setenv( "TR_TIME_LOCALTIME", buf, 1 );
         tr_torinf( tor, "Calling script \"%s\"", script );
         system( script );
     }
diff --git a/libtransmission/tr-dht.c b/libtransmission/tr-dht.c
index bc8cde39e..638c2d5a7 100644
--- a/libtransmission/tr-dht.c
+++ b/libtransmission/tr-dht.c
@@ -25,13 +25,19 @@ THE SOFTWARE.
 #include <stdio.h>
 
 /* posix */
-#include <netinet/in.h> /* sockaddr_in */
 #include <signal.h> /* sig_atomic_t */
 #include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h> /* socket(), bind() */
-#include <netdb.h>
 #include <unistd.h> /* close() */
+#ifdef WIN32
+  #include <inttypes.h>
+  #define _WIN32_WINNT  0x0501	/* freeaddrinfo(),getaddrinfo(),getnameinfo() */
+  #include <ws2tcpip.h>
+#else
+  #include <sys/types.h>
+  #include <sys/socket.h> /* socket(), bind() */
+  #include <netdb.h>
+  #include <netinet/in.h> /* sockaddr_in */
+#endif
 
 /* third party */
 #include <event.h>
diff --git a/libtransmission/trevent.c b/libtransmission/trevent.c
index 497929af5..1378d986f 100644
--- a/libtransmission/trevent.c
+++ b/libtransmission/trevent.c
@@ -26,79 +26,95 @@
 
 #ifdef WIN32
 
-#include <WinSock2.h>
+#include "utils.h"
+#include <winsock2.h>
 
 static int
 pgpipe( int handles[2] )
 {
-        SOCKET s;
-        struct sockaddr_in serv_addr;
-        int len = sizeof( serv_addr );
+    SOCKET s;
+    struct sockaddr_in serv_addr;
+    int len = sizeof( serv_addr );
 
-        handles[0] = handles[1] = INVALID_SOCKET;
+    handles[0] = handles[1] = INVALID_SOCKET;
 
-        if ( ( s = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to create socket: %ui", WSAGetLastError()))); */
-                return -1;
-        }
+    if ( ( s = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
+    {
+        tr_dbg("pgpipe failed to create socket: %ui", WSAGetLastError());
+        return -1;
+    }
 
-        memset( &serv_addr, 0, sizeof( serv_addr ) );
-        serv_addr.sin_family = AF_INET;
-        serv_addr.sin_port = htons(0);
-        serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
-        if (bind(s, (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to bind: %ui", WSAGetLastError()))); */
-                closesocket(s);
-                return -1;
-        }
-        if (listen(s, 1) == SOCKET_ERROR)
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to listen: %ui", WSAGetLastError()))); */
-                closesocket(s);
-                return -1;
-        }
-        if (getsockname(s, (SOCKADDR *) & serv_addr, &len) == SOCKET_ERROR)
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to getsockname: %ui", WSAGetLastError()))); */
-                closesocket(s);
-                return -1;
-        }
-        if ((handles[1] = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to create socket 2: %ui", WSAGetLastError()))); */
-                closesocket(s);
-                return -1;
-        }
-
-        if (connect(handles[1], (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to connect socket: %ui", WSAGetLastError()))); */
-                closesocket(s);
-                return -1;
-        }
-        if ((handles[0] = accept(s, (SOCKADDR *) & serv_addr, &len)) == INVALID_SOCKET)
-        {
-/*              ereport(LOG, (errmsg_internal("pgpipe failed to accept socket: %ui", WSAGetLastError()))); */
-                closesocket(handles[1]);
-                handles[1] = INVALID_SOCKET;
-                closesocket(s);
-                return -1;
-        }
+    memset( &serv_addr, 0, sizeof( serv_addr ) );
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port = htons(0);
+    serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+    if (bind(s, (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
+    {
+        tr_dbg("pgpipe failed to bind: %ui", WSAGetLastError());
         closesocket(s);
-        return 0;
+        return -1;
+    }
+    if (listen(s, 1) == SOCKET_ERROR)
+    {
+        tr_ndbg("event","pgpipe failed to listen: %ui", WSAGetLastError());
+        closesocket(s);
+        return -1;
+    }
+    if (getsockname(s, (SOCKADDR *) & serv_addr, &len) == SOCKET_ERROR)
+    {
+        tr_dbg("pgpipe failed to getsockname: %ui", WSAGetLastError());
+        closesocket(s);
+        return -1;
+    }
+    if ((handles[1] = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
+    {
+        tr_dbg("pgpipe failed to create socket 2: %ui", WSAGetLastError());
+        closesocket(s);
+        return -1;
+    }
+
+    if (connect(handles[1], (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
+    {
+        tr_dbg("pgpipe failed to connect socket: %ui", WSAGetLastError());
+        closesocket(s);
+        return -1;
+    }
+    if ((handles[0] = accept(s, (SOCKADDR *) & serv_addr, &len)) == INVALID_SOCKET)
+    {
+        tr_dbg("pgpipe failed to accept socket: %ui", WSAGetLastError());
+        closesocket(handles[1]);
+        handles[1] = INVALID_SOCKET;
+        closesocket(s);
+        return -1;
+    }
+    closesocket(s);
+    return 0;
 }
 
 static int
 piperead( int s, char *buf, int len )
 {
-        int ret = recv(s, buf, len, 0);
+    int ret = recv(s, buf, len, 0);
+    int werror = 0;
 
-        if (ret < 0 && WSAGetLastError() == WSAECONNRESET)
-                /* EOF on the pipe! (win32 socket based implementation) */
-                ret = 0;
-        return ret;
+    if (ret < 0) {
+        werror= WSAGetLastError();
+        switch(werror) {
+          /* simplified error mapping (not valid for connect) */
+            case WSAEWOULDBLOCK:
+                errno = EAGAIN;
+                break;
+	    case WSAECONNRESET:
+	        /* EOF on the pipe! (win32 socket based implementation) */
+	        ret = 0;
+	        /* fall through */
+            default:
+                errno = werror;
+                break;
+        }
+    } else
+        errno = 0;
+    return ret;
 }
 
 #define pipe(a) pgpipe(a)
diff --git a/qt/qtr.ico b/qt/qtr.ico
new file mode 100644
index 000000000..a11bbb337
Binary files /dev/null and b/qt/qtr.ico differ
diff --git a/qt/qtr.pro b/qt/qtr.pro
index 2d89611d2..67968ce62 100644
--- a/qt/qtr.pro
+++ b/qt/qtr.pro
@@ -9,7 +9,7 @@ INSTALLS += target
 
 CONFIG += qt qdbus thread debug link_pkgconfig
 QT += network
-PKGCONFIG = fontconfig libcurl openssl
+PKGCONFIG = fontconfig libcurl openssl dbus-1
 
 TRANSMISSION_TOP = ..
 INCLUDEPATH += $${TRANSMISSION_TOP}
@@ -17,7 +17,10 @@ LIBS += $${TRANSMISSION_TOP}/libtransmission/libtransmission.a
 LIBS += $${TRANSMISSION_TOP}/third-party/dht/libdht.a
 LIBS += $${TRANSMISSION_TOP}/third-party/miniupnp/libminiupnp.a
 LIBS += $${TRANSMISSION_TOP}/third-party/libnatpmp/libnatpmp.a
-LIBS += -levent
+unix: LIBS += -levent
+win32:DEFINES += QT_DBUS
+win32:LIBS += -levent -lws2_32 -lintl
+win32:LIBS += -lidn -liconv -lwldap32 -liphlpapi
 
 TRANSLATIONS += transmission_en.ts transmission_ru.ts
 
@@ -32,3 +35,4 @@ SOURCES += about.cc app.cc dbus-adaptor.cc details.cc file-tree.cc filters.cc \
 HEADERS += $$replace(SOURCES, .cc, .h)
 HEADERS += speed.h types.h
 
+win32:RC_FILE = qtr.rc
diff --git a/qt/qtr.rc b/qt/qtr.rc
new file mode 100644
index 000000000..a86c74bed
--- /dev/null
+++ b/qt/qtr.rc
@@ -0,0 +1 @@
+IDI_ICON1	ICON	DISCARDABLE "qtr.ico"
diff --git a/qt/utils.cc b/qt/utils.cc
index dfa0a0c37..73d304754 100644
--- a/qt/utils.cc
+++ b/qt/utils.cc
@@ -76,12 +76,12 @@ Utils :: sizeToString( double size )
         else if( size < (int64_t)GIGABYTE_FACTOR )
         {
             displayed_size = (double)size / MEGABYTE_FACTOR;
-            str = tr( "%L1 MiB" ).arg( displayed_size,  0, 'f', 1 );
+            str = tr( "%L1 MiB" ).arg( displayed_size,  0, 'f', 2 );
         }
         else
         {
             displayed_size = (double) size / GIGABYTE_FACTOR;
-            str = tr( "%L1 GiB" ).arg( displayed_size,  0, 'f', 1 );
+            str = tr( "%L1 GiB" ).arg( displayed_size,  0, 'f', 3 );
         }
     }