Help required with eQL - finding certain file types

Hello everyone

I have created the following eQL statement, which I constructed to help me find a particular file format. I'm trying to add a WHERE statement that only displays results / entries where "Files, Name" appears in the AuditDetails.Properties.Description column. However, I'm not sure how to achieve this. I've tried "AuditDetails.Properties.Description LIKE 'Files, Name'" but I get an error message in ALIM front end that reads "Error parsing the eqlText. For more information see the ParseResult.Errors. The FirstError was: The Criteria does not support PseudoColumn 'AuditDetails.Properties.Description'." I'm wondering if the LIKE statement is not the correct one to use for this particular field / column. Does anyone have any ideas? Is what I'm trying to do achieveable?

START WITH Document 
SELECT 
   Id,
   Name,
   Code,
   ApprovalStatus,
   Attributes["Global""Suitability Status"].Value,
   Files.Name,
   Files.FileFormat.Name,
   AuditDetails.Person.FirstName,
   AuditDetails.Person.Surname,
   AuditDetails.Properties.Description,
   AuditDetails.AuditDate 
WHERE 
   Files.FileFormat.Name LIKE 'UNKNOWN MIME TYPE' 
ORDER BY 
   Name

Kind regards

Chris