Is that a BUG? Exporting an item with long name...

[arisaka]

I'm using a registed UR over one month, everything is fine, and UR is a good PDF files keeper. But when I export an item, the exported file (or directory) always has filename which doesn't exceed in 50 characters. For example, the item title "Estimation of number of people in crowded scenes using perspective transformation.pdf" is exported as filename "Estimation of number of people in crowded scenes u.pdf". Any idea?