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I want to display an .eml file in the FilePreview component, but it doesn't work. Is this supported?
It seems, that depending on the Windows version, the system's preview handler is not automatically registered.
You can do so manually in the registry, or implement the "OnLoadPreview" event to assign the Preview Handler GUID, e.g. :
if (UpperCase(ExtractFileExt(eventArgs.Path)) = '.EML') then begin
eventArgs.PreviewHandlerGuid := TShellPreviewHandlerGuids.Mime;