What installs ReportViewerControl.axd?
Okay, time for a stupid question. 
When viewing the browser source code of a ssrs report there is a script tag that references Reserved.ReportViewerControl.axd.  There is a query string parameter of the version.  What installed component on the web server determines that version #?  The reason I ask is I am trying to debug a situation where an installation of our web app (asp.net 3.5) cannot print a report ("Unable to load client control..."), but on our internal machines, we can.  I do not have direct access to the web server/db server.  I can confirm that I can print directly from the Report Manager.  I am trying to piece together any differences b/t the two environments, and one thing I am noticing is the different version query string value.

Our internal says - 

    Reserved.ReportViewerWebControl.axd?OpType=Resource&Version=9.0.30729.4402&Name=Microsoft.Reporting.WebForms.Scripts.ReportViewer.js"

Client says - 

    Reserved.ReportViewerWebControl.axd?OpType=Resource&Version=9.0.30729.1&Name=Microsoft.Reporting.WebForms.Scripts.ReportViewer.js"

Anyone out there know?
What installs ReportViewerControl.axd?
===

Okay, time for a stupid question. 
When viewing the browser source code of a ssrs report there is a script tag that references Reserved.ReportViewerControl.axd.  There is a query string parameter of the version.  What installed component on the web server determines that version #?  The reason I ask is I am trying to debug a situation where an installation of our web app (asp.net 3.5) cannot print a report ("Unable to load client control..."), but on our internal machines, we can.  I do not have direct access to the web server/db server.  I can confirm that I can print directly from the Report Manager.  I am trying to piece together any differences b/t the two environments, and one thing I am noticing is the different version query string value.

Our internal says - 

    Reserved.ReportViewerWebControl.axd?OpType=Resource&Version=9.0.30729.4402&Name=Microsoft.Reporting.WebForms.Scripts.ReportViewer.js"

Client says - 

    Reserved.ReportViewerWebControl.axd?OpType=Resource&Version=9.0.30729.1&Name=Microsoft.Reporting.WebForms.Scripts.ReportViewer.js"

Anyone out there know?