Command Line Utility (acrocmd): '--exclude_names' parameter does not work with directory path names that contain spaces

I've just downloaded and installed the latest demo of ABR 11.5 (32256) (Windows) and I cannot get acrocmd to exclude directories from my backup that contain spaces in their path names.

I've tried the following command line variations...

acrocmd backup disk --progress --output=formatted --plain_archive --backuptype=full --exclude_names=c:\hiberfil.sys,c:\pagefile.sys,c:\data\,c:\virtual machines\,c:\virtual machines shared\ --loc=d:\backup --arc=media.tib --volume=2-1,2-2

acrocmd backup disk --progress --output=formatted --plain_archive --backuptype=full --exclude_names=c:\hiberfil.sys,c:\pagefile.sys,c:\data\,"c:\virtual machines\","c:\virtual machines shared\" --loc=d:\backup --arc=media.tib --volume=2-1,2-2

acrocmd backup disk --progress --output=formatted --plain_archive --backuptype=full --exclude_names=c:\hiberfil.sys,c:\pagefile.sys,c:\data\,c:\virtua~1,c:\virtua~2 --loc=d:\backup --arc=media.tib --volume=2-1,2-2

I've proven that c:\hiberfil.sys (file), c:\pagefile.sys (file) and c:\data (directory) are excluded from the backup fine. I just cannot get the other two ('c:\virtual machines' and 'c:\virtual machines shared') to be excluded.

I can create an equivalent backup job in the GUI and make the exclusions fine.

Please advise whether there is a workaround for this, or if it's a known issue, when a fix might be available.

Thanks
James