mIRC shouldn't be to blame or changed because people are too lazy to remove an unneeded space from the name of a file.
I am generally not one for namecalling, but what kind of clown makes assumptions like "people are too lazy to rename their files" in a case where the files are clearly listed, and with the name changed so that they are invalid?
If anything, it should automatically truncate unsupported filenames to their short 8-character version.
Seifer, I am pretty sure you are not the payed P.R. spokesperson for mIRC, so don't spin some "you are just lazy" reply onto a perfectly legitimate topic.