Yes, you see... let's take the word "file" as an example: in English there's no difference between 2, 3 or 1000 files. The ending will always be "-s".
But in Russian 2 to 4 files will have one ending, 5-20 files will have another ending, 21 another one, 22-24 another again, 25-30 has the ending same as 5-20 and so on...
So for Russian language 3 different variants of plural forms are needed. Otherwise it would be non-grammatical. But if we use structure like: Items: xx (files: yy; folders: zz) - it will be correct.