Say I want to create a backup of folder MainFolder's content using rar. The command

rar a Backup.rar -r MainFolder

does the job.

BUT, if a subdirectory contains more than one file named with non-ASCII (?) characters, then only one of them is archived and the others get excluded.

For example, consider the following directory hierarchy (MainFolder, A and B are folders; a, b, ? and ? are files)

+MainFolder
   +A
      -a
      -b
      -?
      -?
   +B
      -a
      -b
   -a
   -b
   -?
   -?

then the command rar a Backup.rar -r MainFolder skips

MainFolder/A/?
MainFolder/?

while rar a Backup.rar -r MainFolder/* still skips

MainFolder/A/?

Why is it so? Any help is greatly appreciated, thanks!

For the record, I already encountered some issues with non-ascii characters (see this question) that other Linux distributions seem not to have. Anyway, I use Lubuntu 12.04, terminal is lxterminal and echo $BASH_VERSION returns 4.2.25(1)-release. rar version is 4.00 beta 3.

Another curiosity: right-clicking on the folder and selecting Compress... and then .rar still has the same problem. Other options (zip, tar...) behave correctly.