Add compression to any Web or Windows application. Includes self-extraction and AES encryption.
Product Release History
The following is a list of public releases for all components shipped with PowerTCP Zip Compression for ActiveX (Latest Release 2013-07-01)
Current Version:    Released: 2013-07-01
Product fixes in this release:
  • Resolved a com registration error.
  • Zipping and spanning while using encryption will now produce compliant zip archives.  (5336)
  • Calling Unzip on a FileStore object after adding files by calling FileStore.Load or FileStore.Add will no longer result in 0 length files.  (5649)    Released: 2012-07-10
  • There are now separate "Trial" and "Licensed" versions of the dll. Trial dlls are not for deployment and will only function on machines on which a trial version of the product has been installed.    Released: 2010-09-07
Product fixes in this release:
  • Fixed problem extracting to streams introduced in  (5340)    Released: 2010-08-16
Product fixes in this release:
  • When an archive is loaded and zipped with a new name, the original archive is left untouched.  (4913)
  • Timestamps are preserved for extracted files.  (5311)    Released: 2010-02-11
  • The Self-Extract dialog was updated with a cleaner look.
  • The product now supports Winzip-compatible AES encryption, in addition to the Dart proprietary AES encryption.
  • Zip ActiveX is no longer vulnerable to attacks outlined in Microsoft Security Bulletin MS09-035 (
  • Zip ActiveX should now function on all Data Execution Protection (DEP) enabled systems.
Product fixes in this release:
  • File attributes such as read-only are now preserved when extracted from the FileStore.  (4423)
  • The archive comment functionality has been fixed.  (5069)
  • Adding DartStreams with Filenames now works correctly.  (5180)
  • Write errors will no longer occur if a file is accessed by another system process during extraction.  (5195)    Released: 2007-11-27
Product fixes in this release:
  • Corrected problem that produced non-compliant self-extracting exe files  (4568)
  • Fixed problem that would sometimes cause creation of a non-compliant zip file   (4570)    Released: 2007-10-03
Product fixes in this release:
  • A filename containing commas can now be zipped by placing the filename inside of quotes  (1501, 2017)
  • It is now possible to zip a file that is open for writing by another application  (2213)
  • Corrected condition that caused the 'Modified Date' to be incorrect when in the GMT Timezone  (3047)
  • Can now add files with Kyrillic filenames to an archive   (3812)
  • Quickunzip no longer fails when Overwrite is true and a read-only file is encountered  (4346)
  • Fixed various issues relating to the creation/extraction of spanned and split archives  (4516, 2273)    Released: 2007-02-01
  • Changes to F1 help-linking system required rebuild of DLL.    Released: 2006-10-10
Product fixes in this release:
  • Corrected problem with asynchronous self-extracting zip file creation  (2095)
  • Eliminated crash when using multiple Zip controls in the same application  (3438)
  • AES-encrypted zip files of greater than 4GB can now be unzipped  (4092)    Released: 2006-03-27
Product fixes in this release:
  • Fixed memory leak in the FileStore.Add method that occurred when adding more than one file  (3713)    Released: 2005-12-23
Product fixes in this release:
  • Added support for 64-Bit Zip extensions, allowing files larger than 4 Gigabytes to be zipped
  • Fixed an issue where long passwords caused problems with Winzip  (3157)
  • An error is now raised when there is not enough disk space  (3182)
  • "Write Failed" errors no longer occur intermittently when zipping many files  (3324)    Released: 2003-08-13
Product fixes in this release:
  • Fixed a boundary condition problem with certain zip files  (1238, 1697, 1712, 1713)
  • Increased Zip password compatibility with other products  (1614)
  • Fixed a color problem with the self-extractor  (1622)
  • Modified Zip to get file location from LocalHeader INSTEAD of CentralHeader  (1668)
  • Fixed a problem with non US-ASCII characters  (1720)
  • Fixed a small memory leak with QuickZip in certain circumstances  (1743)
  • Fixed a password problem when spanning  (1770)
  • When trying to unzip an empty zip file we will now throw an "Empty Zip File" error  (1857)
  • Fixed a compatibility problem with a particular type of zip file  (1858, 1849)
  • Clarification - minimum ProgressSize must be 256  (1908)
  • Fixed a problem with adding and removing AES encrypted files  (1927)
  • Comments for the Zip file are now properly persisted  (1931)
  • Fixed a file corruption problem after adding/removing after previous Zip operation  (1934, 1925)    Released: 2003-02-28
Product fixes in this release:
  • Fixed a Windows 98 compatibility problem
  • Fixed a gzip problem when the third character was an underscore
  • Fixed a problem with spanning on Windows 98
  • Fixed a slashes compatibility problem with UNIX directories
  • Added support for some non-standard zip formats    Released: 2002-11-27
Product fixes in this release:
  • Fixed a problem with Multibyte-to-Wide Character conversions for filenames
  • Fixed a GPF with certain Gzip files
  • Fixed a licensing problem with MS Access
  • Added support for multi-threading although NOT thread-safe
  • Can be used in COM+ Component Services    Released: 2002-09-16
Product fixes in this release:
  • Fixed unzip problem with zero length files
  • Fixed wildcard bug when using QuickZip
  • Fixed DST time zone problem    Released: 2002-07-02
Product fixes in this release:
  • Fixed date modification problem
  • Fixed a QuickZip and QuickUnzip compatibility problem
  • Fixed problem with unzipping spanned archives
  • Fixed a gzip compatibility problem with CRC
  • Fixed a self-extractor window color problem in XP
  • Fixed a gzip date compatibility problem
  • Fixed a file compatibility problem
  • Changed properties to non-browsable    Released: 2002-02-20
Product fixes in this release:
  • Added Winzip UTF8 support for foreign characters
  • Zip.FileStore.Zip DartStream now works properly
  • Spanning problems with Removable drives corrected
  • Modified date in the FileStore now matches the file on the drive    Released: 2001-10-01
Product fixes in this release:
  • Added 3 levels of AES to encryption algorithms
  • Added ZipSelfExtract for creating self-extracting zip files