"MWC Directory" is not a good term.

Use "Carbide Directory" instead, because that's what it is.

src/plugins/qt4projectmanager/qtoptionspage.cpp

@@ -121,7 +121,7 @@ QtOptionsPageWidget::QtOptionsPageWidget(QWidget *parent, QList<QtVersion *> ver
     m_ui->mingwPath->setExpectedKind(Utils::PathChooser::Directory);
     m_ui->mingwPath->setPromptDialogTitle(tr("Select the MinGW Directory"));
     m_ui->mwcPath->setExpectedKind(Utils::PathChooser::Directory);
-    m_ui->mwcPath->setPromptDialogTitle(tr("Select \"x86build\" Directory from Carbide Install"));
+    m_ui->mwcPath->setPromptDialogTitle(tr("Select Carbide Install Directory"));
 
     m_ui->addButton->setIcon(QIcon(Core::Constants::ICON_PLUS));
     m_ui->delButton->setIcon(QIcon(Core::Constants::ICON_MINUS));

src/plugins/qt4projectmanager/qtversionmanager.ui

@@ -210,7 +210,7 @@ p, li { white-space: pre-wrap; }
       <item row="5" column="0">
        <widget class="QLabel" name="mwcLabel">
         <property name="text">
-         <string>MWC Directory:</string>
+         <string>Carbide Directory:</string>
         </property>
        </widget>
       </item>