zipinfo -v emits an error:

Central directory entry #48:
---------------------------

  com/pixelmed/apps/DoseUtility$OurSourceDatabaseTreeBrowser$1.class

  offset of local header from start of archive:   2892
                                                  (0000000000000B4Ch) bytes
  file system or operating system of origin:      MS-DOS, OS/2 or NT FAT
  version of encoding software:                   2.0
  minimum file system compatibility required:     MS-DOS, OS/2 or NT FAT
  minimum software version required to extract:   2.0
  compression method:                             deflated
  compression sub-type (deflation):               normal
  file security status:                           not encrypted
  extended local header:                          no
  file last modified on (DOS date/time):          2011 Feb 15 19:46:54
  file last modified on (UT extra field modtime): 1988 Dec 17 21:11:08 local
  file last modified on (UT extra field modtime): 1988 Dec 17 18:11:08 UTC
  32-bit CRC value (hex):                         327bc88b
  compressed size:                                622 bytes
  uncompressed size:                              1304 bytes
  length of filename:                             66 characters
  length of extra field:                          59 bytes
  length of file comment:                         0 characters
  disk number on which file begins:               disk 1
  apparent file type:                             binary
  non-MSDOS external file attributes:             000000 hex
  MS-DOS file attributes (00 hex):                none

  The central-directory extra field contains:
  - A subfield with ID 0x5455 (universal time) and 5 data bytes.
    The local extra field has UTC/GMT modification/access/creation times.
  - A subfield with ID 0x000a (PKWARE Win32) and 32 data bytes.  The first
    20 are:   00 00 00 00 01 00 18 00 00 eb 93 91 27 ef bf bd ef bf bd 01.

  error: EF data block (type 0x0001) size 43230 exceeds remaining extra field
         space 10; block length has been truncated.

  - A subfield with ID 0x0001 (PKWARE 64-bit sizes) and 10 data bytes:
    ef bf bd ef bf bd ef bf bd 01.

  There is no file comment.