Client Specific Localization

Client Specific Localization

Looking for advice for this tricky kind(for me!) of localization. We have
different client in our project and we are making localization for client
wise. Condition if client specific resx file is not available then it
should take the default resx language wise.
We have folder structure like this :-
LocalizationFolder
en-us folder
Client1Folder :- en-us client specific resx file
default resx file
We have tried using getglobalresourceobject and getlocalresourceobject
methods. These methods will go to till the last/deepest path in folder
structure. But it is not picking up the client specific resx file. We have
kept naming convention of resx file same for default and client specific
resx file.
Thats why it giving error as 'default.en-us.resx file already exist OR it
conflicts with other file'.
So my question how can i pick up the resx file based on client name and if
it is not present the pick up the default resx file.
Is this possible Or any different approach needs to be follow.