After double clicking on an attachement file I get this message "C:\users\.. - The directory name is invalid."

Hi. I have a problem with opening any attachment in my eM Client. After double clicking on an attachement file I get this message “C:\users…\AppData\Local\Temp\eM Client temporary files\kbewwvxd…pdf - The directory name is invalid.” The file opens afterwards, but getting this msg each time is a bit annoying. Any ide?

Did you change the temporary folder location in Windows? 

To check the location of your temp folder open a command prompt ant type echo %temp%

It should be C:\users…\AppData\Local\Temp. If it is different, then you can change it back to the default and see if that makes any difference.