Blizzard Launcher (the application may actually be called the "World of Warcraft Launcher") is a utility application introduced with patch 1.8.3 to ostensibly provide news links and a minimal set of pre-launch configuration options for the actual game and the patch downloader. Behind the scenes it would also theoretically provide some measure of scanning and protection from trojan viruses and third party cheat programs.
With patch 3.0.8, the launcher was redesigned with a new look. Also added to the "Options" menu was a bare-essentials "Game Preferences" panel, "Downloader Preferences" panel, and a "Parental Controls" link to the "WoW Account Management" website.
Features
Act as a scanner and warn the user of malicious software.
Provide news links about WoW and Blizzard.
Control the options of the Blizzard Downloader in regards to pre-patching.
There was a bit of controversy regarding the Launcher as it was scanning the computer for malicious software, which some people believed to be an invasion of privacy.
Security
The new Launcher may present a security issue. It does not obey the 'default' browser setting of Windows, and thus launches Internet Explorer when any link is clicked. Although this may be fixed in the future, in the past the 'Trial' Launcher has been observed to have some links obey the Default setting, and other links not obey the setting. Thus it could be said that although the Launcher is claimed to aide against some malware, its own behaviour and history of poor coding removes any benefit it may give in this regard.
This section concerns content that is out-of-date. Reason: New look for Win launcher released on 31-Jul-2012.
The Windows version of the launcher has menus at the top-left of the window. The Mac version has the menus at the top-left of the screen (standard location).
This section concerns content exclusive to Cataclysm.Launcher in the RED setup phase.Launcher updated with a Cataclysm-themed layout as per Patch 4.0.1 build 12857.Cataclysm-themed launcher with streaming status color codes.
In the upcoming expansion World of Warcraft: Cataclysm, the launcher will be updated to "stream" installation and patch data. The new launcher is broken up into three stages of download progress:
SETUP (RED): Core game, or 5% of content, is being prepared. You cannot enter the game at this time.
AVAILABLE (YELLOW): Base game, or 70% of content, is not completely applied. You can play, but your game experience will not be ideal. You should ideally have 1 MB/sec or better when choosing to play.
PLAYABLE (GREEN): Extended, or 25% of content, is almost complete. You may begin playing at this stage with few game issues. You should ideally have 1 MB/sec or better when choosing to play.
The Updater and Downloader have been integrated closely into the Launcher, resulting in less application switching when patching and installing.[1]
Later text, for patch updates, for color coded streaming status (percentages and other specifics were removed):
SETUP Core game content is being prepared. You cannot enter the game at this time.
AVAILABLE Major game content is not completely applied. You can play, but your game experience will not be ideal.
PLAYABLE Final game content is almost complete. You may experience a few game issues while playing at this stage.
Optimization
Optimization notificationThis section concerns content that is not yet released.
As of Patch 4.3.2 on the PTR, the launcher now has an "optimization" feature.
It will reorganize the game files currently installed on your hard drive to integrate all previous patch files, essentially "cleaning up" what’s on your computer and reducing the full installation size and will process these cleanups with no additional hard drive space required beyond what the patch is adding. Because of that you may see them appear more frequently with patches.[2]
Here is the message (it may launch a web browser to show this message) it gives when it first runs:
The Launcher is optimizing your World of Warcraft install. This is a process we run from time to time to improve game performance and reduce the size of the install on your hard drive.
The entire process will take approximately 15 minutes under normal conditions. Please do not close the Launcher or run World of Warcraft during this time.
Thank you for your patience!
History
Mac version
World of Warcraft Public Test Launcher.app 1.1.0.1398 - As of PTRPatch 5.2.0 build 16547 on 5-Feb-2013.
World of Warcraft Launcher.app 1.0.0.1276 - No version change, but undocumented updates downloaded on 5-Feb-2013.
World of Warcraft Public Test Launcher.app 1.0.0.1398 - As of PTRPatch 5.2.0 build 16486 on 26-Jan-2013.
Systems Patch
World of Warcraft Launcher.app 1.0.0.1276 - As of Patch 5.1.0A build 16357 on 10-Dec-2012.
World of Warcraft Launcher.app 1.0.0.1113 - As of Patch 5.0.4 build 16016 on 28-Aug-2012.
World of Warcraft Beta Launcher.exe 1.0.0.1034 - As of Patch 5.0.4 build 15929 on 2-Aug-2012.
World of Warcraft Beta Launcher.exe 1.0.0.920 - As of Patch 5.0.1 build 15762 on 19-Jun-2012.
No version change, but new look as of Patch 5.0.4 build 15913 on 31-Jul-2012.
World of Warcraft Beta Launcher.exe 1.0.0.920 - As of Patch 5.0.1 build 15762 on 13-Jun-2012.
World of Warcraft Beta Launcher.exe 1.0.0.833 - As of Patch 5.0.1 build 15726 on 23-May-2012 (version didn't change, but a warning alert that the launcher was updated appeared).
World of Warcraft Beta Launcher.exe 1.0.0.833 - As of Patch 5.0.1 build 15699 on 18-May-2012.
4.2.1.2747 - As of Patch 5.0.4 build ????? on 20-Jul-2012.
4.2.1.2730 - As of Patch 4.3.3 build 15354 on 3-Apr-2012.
Patch 4.2.0 (28-Jun-2011): The PTR temporarily had its own launcher called "World of Warcraft LauncherB" that was called from the regular launcher, but was later removed.
/Patch 4.0.1 (12-Oct-2010): New Cataclysm Launcher. It allows you to play although not all files have been downloaded (red - yellow - green state).
Patch 3.0.8 (2009-01-20): The "Show Launcher" checkbox has been removed; this behavior is now active by default.
Patch 2.1.0 (22-May-2007): The launcher will now start the game automatically, unless the "Show Launcher" option on the login screen is checked.