This dialog box is displayed when WinZip® could not create a required temporary file on the disk drive listed in the dialog box. Possible causes are that the disk drive is invalid, or that the root folder of the disk is full.
WinZip determines which disk to use for temporary files by checking the values 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 creates temporary files on your C: drive.