If you have a custom view on document library where you need to show the each file name with extension. This is fairly simple and can be done this way.
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Open your document library view in SharePoint designer and follow these steps
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Open your web site the SharePoint designer
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Go to you document library and open the yourviewname.aspx file in design view.
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Select the WebPartPages:ListViewWebPart control
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Right click on WebPartPages:ListViewWebPart control and select “Convert to XSLT data View”
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Right click on the column where you want to show file extension and select “Insert formula”
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In the right hand box delete the existing entry and insert @FileLeafRef
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Click “Save” on the SharePoint designer ribbon.
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Refresh the document library and now you will see the document name with extension in the new column.
Admin