When searching for documents and files located in SharePoint or OneDrive sites, it might make sense to adjust the query approach based on the metadata for the documents and files of interest. Files and documents have relevant properties like Author, Created, CreatedBy, FileName, LastModifiedTime, and Title. Most of these proprieties aren't relevant when searching for communications content in Exchange Online, and using these properties might lead to unexpected results if used across both documents and communications. Additionally, FileName and Title of a document might not be the same and using one or the other to try to find a file with specific content might lead to different or inaccurate results. Keep these properties in mind when searching for specific document and file content in SharePoint and OneDrive., Most of these proprieties aren't relevant when searching for communications content in Exchange Online, and using these properties might lead to unexpected results if used across both documents and communications. The extension of a file; for example, docx, one, pptx, or xlsx. fileextension:xlsx: All Excel files (Excel 2007 and later , Now, you can search files again to see if File Explorer search not working is fixed. Fix 2: Make Sure Windows Search Service Is Enabled. The problem might appear if the Windows Search service is disabled. So, you need to make sure the service is enabled and here’s how to do it. Step 1: Press Windows + R to open Run window..