7 – Zip : Diagnostic messages

Hi guys,
I downloaded several files in 7-Zip files. While opening those files I received an error message frequently. The screenshot of the error message is as under. Operating system of my machine is Windows 7 Home Premium. Have you any idea for the error? Please help.
Thanks in advance.

7-Zip: Diagnostic messages
# Message
0 Can not open file ‘C:UsersFaltDesktopNew Folder3a_oldmombasa.map.diz’ as archive
