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KB2756872 Upgrades Windows 8 RTM To GDR Release

Prior to official launch of Windows 8 on this coming Oct 26, Microsoft has released the General Availability Cumulative Update (KB2756872) to upgrade Windows 8 RTM to GDR release.

This post-RTM update is huge, about 160MB for 64bit and 97MB for 32bit system, contains fixes for improving reliability and performance in battery life, Windows 8 apps, Start screen, audio and video playback, and driver compatibility.
Following the update, both of these Registry keys value also changed in tandem (for 64-bit version):

BuildLab
RTM release: 9200.win8_rtm.120725-1247
GDR release: 9200.win8_gdr.120926-1855

BuildLabEx
RTM: 9200.16384.amd64fre.win8_rtm.120725-1247
GDR: 9200.16424.amd64fre.win8_gdr.120926-1855

Windows 8 GDR BuildLab version.

What’s that RTM and GDR mean? And, how to interpret the BuildLab and BuildLabEx version number?

The RTM is short for Release to Manufacturing/Marketing (ready for general availability) and GDR means General Distribution Release (containing security and critical stability issue fixes).

As for the Registry keys value, I think it logically means build 9200 of 16424th compilation revision 16424 compiled on x64 system in lab win8_gdr at 2012-09-26 18:55. No? Wrong? OK, prove it with reference link of reputable source :)

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