the temporary file aria2c creates when downloading a file is recognized as truetype font data on my system. i'm not sure it's my system's fault or just a coincidence between those file formats. if the .aria2 file can be correctly identified, it would be great.
It seems .aria2 file has coincidentally the same magic with font file.
It looks weird, but it causes no problem. When next .aria2 file format upgrade is done, I'll consider unique magic.