Probably not, but I agree that it's worth mentioning.
It doesn't follow any common verbalization of the '5' character. It's also at the front of the word, so you have no clues to start you off on the right path. Even when you know how to say it you still want to say "five" when you read it. I would give the name a very low usability/accessibility score, and frankly it pushes me towards not using the product ("yeah I use this thing called filer - if you want to check it out it's actually spelled with a number five, and then 'iler' - yeah I don't get it either"). If we're going with the 5 theme I would have preferred 5note or 5notes.