Here is a quote from the "Changes" file... 
0.14 Sat Feb 23 10:36:50 2008 
     - using the function "$self->{_connection}->dir($dir)" to the sea
+rch of the directory
     the FTP-server should return the following format as response of 
+the LIST command:
     -r--r--r--   1 ftpuser  ftpusers       576 Feb 23 09:23 file.txt
     drwxrwxr-x   2 ftpuser  ftpusers       512 Feb 21 13:54 Dir1
     Directory- or filenames should not contain any white space.
     - add some tests

[download]
It looks like the author was aware of the limitation.

In reply to Re^3: Net::MirrorDir help by toolic
in thread Net::MirrorDir help by sunnyfedora99

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