SMB Client Error

Hello
I've installed PDF Creator on Server Windows 2012 R2.
After, I've set the Autosave in "Use this directory for save" with this command :
\\\<ClientComputer>\c$\Users\<Author>\Documents\PDF\
But PDF Creator has writen the following in the grey rectangle under :
\\'Preview ClientComputer'\c$\Users\'Preview Author'\Documents\PDF\

So, the SMBClient/Connectivity return an error (ID30800) as it cannot resolved the server name "Preview ClientComputer". Of course it's not a servername registred in DNS.

Have you an idea How to solve this issue?

Thanks in advance