From the Security & Compliance admin center, you create a content export as shown in the exhibit. (Click the Exhibit tab.)
What will be excluded from the export?
Unrecognized file formats are excluded from the search.
Certain types of files, such as Bitmap or MP3 files, don't contain content that can be indexed. As a result, the search indexing servers in Exchange and SharePoint don't perform full-text indexing on these types of files. These types of files are considered to be unsupported file types.
https://docs.microsoft.com/en-us/office365/securitycompliance/export-a-content-search-report
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