file extension comparison needs to be case insensitive.

components/contentselector/model/esmfile.cpp

@@ -65,7 +65,8 @@ QByteArray ContentSelectorModel::EsmFile::encodedData() const
 bool ContentSelectorModel::EsmFile::isGameFile() const
 { 
     return (mGameFiles.size() == 0) &&
-        (mFileName.endsWith(QLatin1String(".esm")) || mFileName.endsWith(QLatin1String(".omwgame")));
+        (mFileName.endsWith(QLatin1String(".esm"), Qt::CaseInsensitive) || 
+        mFileName.endsWith(QLatin1String(".omwgame"), Qt::CaseInsensitive));
 }
 
 QVariant ContentSelectorModel::EsmFile::fileProperty(const FileProperty prop) const