File type checking not Windows conform

const std::string GzipExtension = ".gz";

bool DataUtils::Format::isGZipped(const std::string& name)
{
    return BaseUtils::Filesystem::extension(name) == GzipExtension;
}

This is not conform to Windows where upper/lower is without meaning. Even on Linux I could imagine they import files from Windows systems.

-> The check should be case insensitive.

The same applies to more functions like the mentioned one.