Slider AM tries to download and read the app package to get configuration described in the <configFiles> section of metainfo. If the <fileName> tag is not set for the configFile, there is no need to download the whole app package just to read the config file.
This is impacting performance if we have a big package, e.g. 200MB. We don't want AM to read the package just to read some default configuration for the agent. So in metainfo we can set <fileName> to "" for AM to skip this step.