What should I to do for change the limit of preview files ( docx and xlsx ) to display documents larger than 1 MB.My installation is Alfresco Community 5.1 and the Windows Server 2012 operating system.
You need to configure higher limits on the allowed source document size via transformer properties. See the documentation for details and default configuration as reference. Specifically the OpenOffice transformer properties need to be changed.
the default config for transformer https://github.com/Alfresco/alfresco-repository/blob/master/src/main/resources/alfresco/subsystems/Transformers/default/transformers.properties
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