In addition of [Stephen Kitt's answer][1], you could consider (especially if you are a developer yourself, and if the program -`file` in your case- source code is not too difficult to understand) fetching the source code of that program (perhaps from your distribution) - since it is [free software][2] - and patching it, and also sending a patch.

If you took time to study the source code, you'll probably make a better bug report.

If you took more time to **propose a fixing patch**, you are likely to be considered more seriously (and IMHO you are acting more in the spirit of free software).

So use the freedom provided by [free software][2]: *study its source code* (freedom#1) and *improve it* (freedom#3).

Today it is very easy to publish (e.g. on [github][3]) your improved version and *share it* (freedom#2).


 [1]: https://unix.stackexchange.com/a/440845/50557
 [2]: https://en.wikipedia.org/wiki/Free_software
 [3]: http://github.com/