Could not load file or assembly 'Microsoft.ReportingServices.Interfaces'

In the last week we’ve had three clients report a problem with our December release when running on Windows Server 2003 64 bit.

Server Error in ‘/RSinteract’ Application.

Could not load file or assembly ‘Microsoft.ReportingServices.Interfaces’ or one of its dependencies. An attempt was made to load a program with an incorrect format.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.BadImageFormatException: Could not load file or assembly ‘Microsoft.ReportingServices.Interfaces’ or one of its dependencies. An attempt was made to load a program with an incorrect format.

It seems Microsoft.ReportingServices.Interfaces.dll version 9.0.1399.0 won’t load on a 64 bit server, the hotfix is to replace it with this version:
http://www.rsinteract.com/download_files/Microsoft.ReportingServices.Interfaces.zip
The default location is C:\Program Files (x86)\ICS\RSinteract\Website\bin\
IIS should be reset afterwards.

This issue will be resolved in the next big release in February 2009

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