In windows, you can add periods to a file name, because it reads the last one as the file extension. While the periods appear to be removed on the server end, the link to that file woll not remove them. This entry is an example:
https://battleofthebits.com/player/EntryDonload/50969/BotB%252050969%2520Hip%2520Hop%2520Didn%27t%2520Kill%2520Rock...%2520But%2520It%2520Did%2520Steal%2520A%2520Pen.mp3
Removing the periods in the link allows you to download the file as normal.

i am confused ... are you adding something to a url to make it fail?

Hello, and good day! You could take the entire filename from the hyperlink and download it from too, as in the next hyperlink for:
https://battleofthebits.com/player/EntryDonload/50969/

You could swap a period in an unified resource locator for its equivalent ASCII code in the next format %2E

If you click "download" on my entry here, it should make sense
https://battleofthebits.com/arena/Battle/6872/MainScreen
Basically, the server seems to store the entry fine, but the download link generated contains the periods (an invalid character.)

i'm pretty sure it's a known bug with ellipses in song titles... you can indeed still get to the file by changing the "..." in the URL to %2E%2E%2E, as Oli pointed out!

But... I can't change it. I don't have perms for that

known bug. edit the url