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To Q: or not to Q: – that is the question

May 19, 2011

… at least that is one question that often is discussed in an App-V environment.

While monitoring an application setup with the App-V Sequencer, you will have to decide if you install the application to the C: drive (the installer’s default location) or to the Q: drive. Microsoft strongly recommends to always install to the Q: drive (an “MNT install”). However, many
applications proved to work fine after they were installed to C: (a “VFS install”).
This article discusses some of the myths and facts around that “C: vs. Q:” or “VFS vs. MNT” installations.

Note: To limit the size of that post, there is an “Extended Version” availabe as PDF at This PDF contains more detailed information, esp. the details to reason the table’s content.

[Update 2011-05-23: Tim Mangan blogged about an issue when Sequencing to Q: in the App-V 4.6 SP1 Sequencer.]


Posted in App-V, Sequencer
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Defective component registration with 4.6 SP1 Sequencer

May 13, 2011
1 Comment

This is a loose translation of Sebastian Gernert’s blog articel “4.6 SP1 Sequencer registriert Dateien nicht richtig…” (German).

Sebastian namely thanks Jan Pfisterer and Marius Gawenda, who pointed him to that issue.

Because the new Sequencer does not require a separate hard disk partion for the Q: drive (but uses a Symbolic Link), some components (like OCX controls) may not register correctly. In their registration, they may point to the Symbolic Link’s target (on the C: drive) instead.


App-V Management Server Installation Error 25120: Two likely causes

May 5, 2011
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The installation of the App-V Management Server 4.5.x on a Windows Server 2008/2008R2 occasionally fails with an “The installation programm was unable to create the required IIS virtual directory: Error 25120”

The most likely cause for this is that the “IIS Management Scripts and Tools” and/or the “IIS 6 Management Compatibility” role features are not installed. This has been discussed and confirmed several times, like at BallBlog, SystemCenterCentral, the App-V forum on Technet, Miito’s Blog and other sources (like here).

Another potential cause, that obviously is not so common, is a missing “Default Web Site” in IIS…


3rd German Usergroup’s App-V Day: May 30th 2011, Hamburg

May 4, 2011
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The 3rd German App-V Day (open User Group event) will be on May 30th 2011 in Hamburg

Registration and Agenda:


Posted in App-V
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