Well it should be there or avast would have some problems I would have thought.
The operating system would have no differences in file type used for different countries as it is a file used by avast and it doesn't care what the country is, it should be the same
See my image, are the file extensions shown in your windows explorer list, e.g. not a file just called Avast4, if so check the Type column and you should see a file type of MDB File ?
Note: don't worry about the file sizes and dates in my image they are likely to be different from user to user.