Links

Please note that the below links may to change, over time.

Official Microsoft links

Caution: Microsoft may change or broke this link, so isn't sure that it is working as expected.

Common file and registry virtualization issues in Windows Vista or in Windows 7
http://support.microsoft.com/kb/927387/en-us

Inside Windows Vista User Account Control
http://technet.microsoft.com/en-us/magazine/2007.06.uac.aspx

VISUAL STUDIO

Visual Studio 6.0
http://msdn.microsoft.com/en-us/library/ms950417

Product Updates for Visual Studio 6.0
http://msdn.microsoft.com/en-us/vstudio/aa700916.aspx

VISUAL BASIC

Visual Basic 6.0
http://msdn.microsoft.com/en-us/library/hh127540

Controls shipped in Visual Basic 6.0
http://support.microsoft.com/kb/194784/en-us

Visual Basic 6.0 Resource Center
http://msdn.microsoft.com/en-us/vstudio/ms788229.aspx

FILE: VBUSC.EXE Provides Licensing for Discontinued Controls
http://support.microsoft.com/kb/195353/en-us

Support Statement for Visual Basic 6.0 on Windows Vista, Windows Server 2008, Windows 7, and Windows 8
http://msdn.microsoft.com/en-us/vstudio//ms788708.aspx

Tools & useful links

MZ-Tools add-in
http://www.mztools.com/index.aspx

Please note that the version 3.x of MZ-Tools is no longer available, in official site.
However you can find the latest free version on the WAYBACKMACHINE:

MZ-Tools 3.0 - Productivity Tools for Visual Basic 6.0, 5.0 and VBA
MZ-Tools 3.00.1212 released (October 10, 2013)
https://web.archive.org/web/20150206030211/http://www.mztools.com/v3/mztools3.aspx

API Viewer
http://www.activevb.de/rubriken/apiviewer/index-apiviewereng.html

API Guide
http://allapi.mentalis.org/agnet/apiguide.shtml

API List
http://allapi.mentalis.org/apilist/apilist.php