This isn't supported directly but here is what I have done...
Separate your files into groups by country code (like what you would do for normal resource files) and then create a localized string in each of your localized string.xml files called something like "prefix" (where prefix would be "en" for English for example).
Then when you build your asset filenames simple use something like getString("prefix") + "-" + "<name-of-asset->
.
At least some variation of the above should work for you.
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