Disabling the thumbnail preview is a function of Microsoft Windows. Windows has opted to not show the preview thumbnail if a file has the CIFS offline attribute set. When an archive task occurs, the CIFS attribute is set so Windows will stop displaying the review information. There are alternate programs that can be used to browse the directory structure that will not turn off preview, but this is not something that is controlled by the CTA or the archive process.
For NetApp this cannot be disabled the offline attribute is not possible for archived files as it would break the FPolicy recall functionality. For VNX there is option to disable the offline attribute but this should not be done if CIFS is used to archive the files because there are some severe consequences for CTA.