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.
[Reference:, https://docs.microsoft.com/en-us/microsoft-365/compliance/partially-indexed-items-in-content-search?view=o365-worldwide, , https://docs.microsoft.com/en-us/office365/securitycompliance/export-a-content-search-report, , , , , , , ]
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