By: admin

With the Emergence of App-V 5, we no longer have PKG files structure under virtual Drive (generally as Q:\) as against in APP-V 4. The changes made by the user are hidden in various folders and registry keys. Essentially, file changes are stored under:


  • %APPDATA%\Microsoft\AppV\Client\VFS (for roaming appdata)
  • %LOCALAPPDATA%\Microsoft\AppV\Client\VFS (for everything else)


While registry changes are stored under:


  • HKCU\Software\Microsoft\AppV\Client\Packages\<PackageGUID>\REGISTRY


But due to certain limitations of APP-V 5.0, or due to the flaw in the designing of the application, certain files and registries may not be written in the above mentioned location. This depends on, the environment under which your application is running has:


  • UAC enabled
  • App is not triggered as administrator
  • The app is 32-bit
  • The app has no embedded or external mechanism to tell it which execution level to use ( i.e. as Invoker, highest Available, require Administrator)


Then the application or the sequencer has the tendency to re-direct the failed “writes” attempt to the below mentioned location via a process known as UAC file Virtualization.


  • %LOCALAPPDATA%\VirtualStore
  • HKCU\Software\Classes\VirtualStore





During my practice over such applications, I figured out that since redirection happens to a specific location, it is advisable to include the above two locations under Parse Items list after removing the same from Exclusion items list. (Refer the figure below). This is done so that the Application does not fail from launching a shortcut.


Thumb rule


Example of UAC File Virtualization (With UAC enabled):

Consider a case where UAC is enabled:

After Sequencing the app, launch the shortcut in the application (to create feature block 1) from the Start Menu instead of launching it from the conventional sequencer itself.


Once the shortcut is launched, the application with the help of sequencer mechanism will redirect all the run time data to the above said locations, as shown below:







If the Parse Items list does not contain the above two locations, the sequencer will show it in the form of a warning in a dialogue box as shown below:





Consequently, the application will fail to launch.



Posted by-




Disclaimer: Developer’s Corner Section of ISHIR blog is contributed and maintained by independent developers. The content herein is not necessarily validated by ISHIR.




Leave a Reply

Your email address will not be published. Required fields are marked *

19 + ten =

Schedule A Call

ISHIR is a globally diversified leading offshore software development company with experience and expertise in a broad range of services and solutions. With 15 years of experience in the IT industry, ISHIR enables cost-effective and dependable software outsourcing solutions. We have over 900 satisfied clients across the globe and matured to become an extension of their internal teams.

We are experts in the field of software development, web design and development, managed cloud services, software testing, application development services and customer software development. India is a sought after market for addressing software development outsourcing requirements for enterprises across the world. ISHIR offers the value add of in-depth knowledge of all the key industries combined with the commitment to innovate and offer next-generation technological advantage. As a renowned custom software development company in India, one of the key differentiators that we offer is to understand our clients’ business objectives and challenges and align the right technology to provide customized solutions.

Headquartered in Dallas, with global delivery center in Noida, India, we are one of the preferred software development companies with a unique combination of skilled people, world-class processes and robust technology. ISHIR has a successful track record of delivering hundreds of projects using various tools and technologies. We have delivered on-time and on-budget custom software development services and application development services. Using our flexible delivery models, we have ensured success in all our offshore outsourcing projects. We have added substantial value and savings for our clients, often exceeding up to 85%, making us a dependable offshore Software Development Company. As a front runner software development company, India, we ensure that we go the extra mile to maximize ROI for our clients and act always as a trusted advisor of our clients.