CmdID / PowerShell / Cmdlets / Get
Get-SearchDocumentFormat
Use the Get-SearchDocumentFormat cmdlet to retrieve details of file formats supported by Exchange Search. Exchange PowerShell reference
From the Exchange PowerShell reference 2 parameters Its page in the reference
Parameters
-IdentityThe Identity parameter specifies the identity of a file format.-ServerThe Server parameter specifies the Exchange server where you want to run this command.