Migrate from SharePoint 32-bit environment to 64-bit environment

While migrating from a 32-bit environment to 64-bit environment, a common issue arises as to custom and third party assemblies start giving BadImageFileFormat error

The best approach to solve this issue is to

  • Get 64-bit version of the third party assemblies
  • Complile custom assemblies to run on any platform “ANY CPU”
An alternate (not recommended) approach would be to
  • Run the IIS of the 64-bit server to run as 32-bit

Refer the below link for more information

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