Class Design Question

I have a class which holds key-value pairs where the keys are common
Windows file extensions and the values are associated file content
descriptions (for each extension).

This class has a method which gets a value given a key.

e.g.:

class FileDescriptionTable {
public void Get(string fileExtension) {
return GetDescription(fileExtension);
}
}

I was considering changing it so that, instead of taking a key (a file
extension), it takes a full file name, and determines the extension itself
(by making a routine call):

class FileDescriptionTable {
public void Get(string fileName) {
return GetDescription(FileUtility.GetExtension(fileName));
}
}

Is this a good idea, or would it give FileDescriptionTable too much
responsibility? I can't quite decide.
.

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