Hello,
Thank you for your information.
I will update our bug managers of this and advise for their feedback in this regard.
I personally was able to replicate the issue of PDF attachments not being opened (with the space characters in the name) with or without it enabled. [However I have also encountered users who corrected the behaviour with it enabled assuming their Java is up to date and functional on that select PC]
However at this stage, I have been advised this defect is currently being tracked to be fixed -- the ETA Of such is not yet available for me to share.
Thanks,
Matthew