To view a file, WinZip® normally extracts the file to disk, reads it, and erases the temporary disk file. WinZip determines which disk to extract to by checking the value of the WZTMP=, TMP=, TEMP=, and PKTMP= environment variables. To conserve space on the DOS command line, WinZip creates temporary files in the root folder of the specified drive. If none of these environment variables is set, WinZip extracts to the root folder of your C: drive.
The message The disk file "filename" already exists. Should WinZip overwrite it so that the file in the archive can be viewed? is issued if a file with the requested name already exists on disk. If you choose Yes, the existing disk file will be overwritten, and processing will continue. If you select No, WinZip will cancel the view operation for this file.