imageLast week I wrote about an error message the users received when opening documents from SharePoint.

The article showed how to fix the problem but it didn’t feel good that I didn’t know where this “TreatAs” value was coming from.

I figured that I could read the timestamp key from the registry to see at what/date time the value was created. This value can be read using the RegQueryInfoKey API but there are various tools that can read it.

I used the RegScanner tool from NirSoft:

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Since the functionality is related to Office I suspected that the “TreatAs” value was created by the “Microsoft Office 2010 Deployment Kit for App-V” that was recently introduced into the enviroment.

So I tracked the deployment history in Automation Manager via the Job Results. I selected the Deployment Kit Module and clicked Details:

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And Details again in the Next screen:

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Then I went to the Log tab where I could see that the Value was indeed created during installation of the Deployment Kit for App-V:

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The Value in the TreatAs Value seems related to the SharePoint Proxy registry key as mentioned in the document “Prescriptive guidance for sequencing Office 2010 using Microsoft App-V 4.5 or 4.6“.

I was using the following parameters:

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So if you are deploying the Office 2010 Deployment Kit for App-V watch out for this Value and test with SharePoint!