Consultancy needed on dotnet issue.

A customer has modified the C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\[login to view URL] file manually before we became involved. He added the following string to it <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:[login to view URL]"> <dependentAssembly> <assemblyIdentity name="[login to view URL]" publicKeyToken="bdda2d694ae22a86" culture="neutral" /> <bindingRedirect oldVersion="6.1.1.532" newVersion="6.1.1.639"/> </dependentAssembly> </assemblyBinding> </runtime> which causes the previous version of the software (superoffice , a german crm program) to work but which causes the next version of the software not to work anymore. When we remove this string from the [login to view URL] file, the new version of the application works. Is it safe to add the removal of this string to the installation package of the new software version. We can always put a backup action of the original file to the script as well. If not do, do you see any alternative to solve this issue ?