How to search the Library for reports that depend on a file data source?

The Library Administration tool can search for library items, and keywords are used to identify those items.  I would like to search the Library for reports (Analysis) that depend on a file data source.  A file data source is created when you load data from a file into the report; these can be for example a CSV, Excel or .sbdf file. The Data Source is then displayed by the Data Table Properties, Source Information dialog box.  For example:

Select File > Add Data Tables...

               Source: Data loaded from file

                Type: Microsoft Excel Workbooks

                Location: \\mypath\myfile.xls

                Worksheet: myworksheet

There is a key word and function for  that can be combined to search for data sources: "item_type:datasource"

How can the datasource function be combined with a keyword in a search to find all reports that use files?

item_type:datasource myfile.xls   or item_type:datasource \\mypath\myfile.xls  or item_type:datasource Data loaded from file

None of these seem to work.

Thank you

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