I can only add Demo Server with Build 610, SRV-files don't work in the config folder.
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See this topic MetaTrader 4 Build 600 with Updated MQL4 Language and Market of Applications Released, first post, point 10.
... Given that the OP seems to be talking about manual addition of .srv files, the issue is more likely to be that .srv files are read from %appdata%\metaquotes\terminal\xxxx\config, not from <mt4installation>\config.
(Unless MT4 is run in /portable mode, the files in <mt4installation>\config are only created by the initial installation; are copied to %appdata%\metaquotes\terminal\xxxx\config; and are not updated or maintained in <mt4installation>\config after that.)