I often want to view the source data is the native software and open it from FME Form via Open Containing Folder, then open that file. My suggestion is to add an option to open that file in the native Windows program, e.g. ‘View Source Data’ in native, or ‘Open in Native’ so you remove a step.
If the file was a DWG it would auto-open in whatever Windows/user has assigned to open a DWG, e.g.AutoCAD 2027. If it’s a CSV, it opens in Excel (or Notepad++ for example) if that’s what the user has set. Thanks.