diff --git a/src/file_transfers.py b/src/file_transfers.py
index 9f3be01..e6200c1 100644
--- a/src/file_transfers.py
+++ b/src/file_transfers.py
@@ -121,7 +121,7 @@ class SendTransfer(FileTransfer):
         super(SendTransfer, self).__init__(path, tox, friend_number, size)
         self.state = TOX_FILE_TRANSFER_STATE['OUTGOING_NOT_STARTED']
         self._file_number = tox.file_send(friend_number, kind, size, file_id,
-                                          basename(path) if path else '')
+                                          bytes(basename(path), 'utf-8') if path else '')
 
     def send_chunk(self, position, size):
         """
@@ -167,7 +167,8 @@ class SendFromBuffer(FileTransfer):
         super(SendFromBuffer, self).__init__(None, tox, friend_number, len(data))
         self.state = TOX_FILE_TRANSFER_STATE['OUTGOING_NOT_STARTED']
         self._data = data
-        self._file_number = tox.file_send(friend_number, TOX_FILE_KIND['DATA'], len(data), None, file_name)
+        self._file_number = tox.file_send(friend_number, TOX_FILE_KIND['DATA'],
+                                          len(data), None, bytes(file_name, 'utf-8'))
 
     def get_data(self):
         return self._data
@@ -246,7 +247,7 @@ class ReceiveToBuffer(FileTransfer):
 
     def __init__(self, tox, friend_number, size, file_number):
         super(ReceiveToBuffer, self).__init__(None, tox, friend_number, size, file_number)
-        self._data = ''
+        self._data = bytes()
         self._data_size = 0
 
     def get_data(self):
@@ -257,17 +258,16 @@ class ReceiveToBuffer(FileTransfer):
             self._creation_time = time()
         if data is None:
             self.state = TOX_FILE_TRANSFER_STATE['FINISHED']
-            self.signal()
         else:
-            data = ''.join(chr(x) for x in data)
+            data = bytes(data)
             l = len(data)
             if self._data_size < position:
-                self._data += ('\0' * (position - self._data_size))
+                self._data += (b'\0' * (position - self._data_size))
             self._data = self._data[:position] + data + self._data[position + l:]
             if position + l > self._data_size:
                 self._data_size = position + l
             self._done += l
-            self.signal()
+        self.signal()
 
 
 class ReceiveAvatar(ReceiveTransfer):
diff --git a/src/list_items.py b/src/list_items.py
index c663780..d62d2d0 100644
--- a/src/list_items.py
+++ b/src/list_items.py
@@ -430,7 +430,7 @@ class InlineImageItem(QtGui.QScrollArea):
         self.setWidget(self._image_label)
         self._image_label.setScaledContents(False)
         self._pixmap = QtGui.QPixmap()
-        self._pixmap.loadFromData(QtCore.QByteArray(str(data)), "PNG")
+        self._pixmap.loadFromData(data, 'PNG')
         self._max_size = width - 30
         self._resize_needed = not (self._pixmap.width() <= self._max_size)
         self._full_size = not self._resize_needed
diff --git a/src/mainscreen_widgets.py b/src/mainscreen_widgets.py
index ba8fcb9..77c993f 100644
--- a/src/mainscreen_widgets.py
+++ b/src/mainscreen_widgets.py
@@ -109,7 +109,7 @@ class ScreenShotWindow(QtGui.QWidget):
                 buffer = QtCore.QBuffer(byte_array)
                 buffer.open(QtCore.QIODevice.WriteOnly)
                 p.save(buffer, 'PNG')
-                Profile.get_instance().send_screenshot(str(byte_array.data()))
+                Profile.get_instance().send_screenshot(bytes(byte_array.data()))
             self.close()
 
     def keyPressEvent(self, event):
diff --git a/src/profile.py b/src/profile.py
index d922d03..3a40da6 100644
--- a/src/profile.py
+++ b/src/profile.py
@@ -912,6 +912,7 @@ class Profile(contact.Contact, Singleton):
         self.send_inline(data, 'sticker.png')
 
     def send_inline(self, data, file_name, friend_number=None, is_resend=False):
+        print('Send inline:' + str(type(data)))
         friend_number = friend_number or self.get_active_number()
         friend = self.get_friend_by_number(friend_number)
         if friend.status is None and not is_resend:
diff --git a/src/tox.py b/src/tox.py
index 0801b77..96c01d1 100644
--- a/src/tox.py
+++ b/src/tox.py
@@ -1202,7 +1202,7 @@ class Tox(object):
         result = self.libtoxcore.tox_file_send(self._tox_pointer, c_uint32(friend_number), c_uint32(kind),
                                                c_uint64(file_size),
                                                string_to_bin(file_id),
-                                               c_char_p(bytes(filename, 'utf-8')),
+                                               c_char_p(filename),
                                                c_size_t(len(filename)), byref(tox_err_file_send))
         tox_err_file_send = tox_err_file_send.value
         if tox_err_file_send == TOX_ERR_FILE_SEND['OK']: