Menu: File→Run Default App
Shortcut: Ctrl-U
Clicking File→Run Default App or typing the shortcut key ctrl-u runs the Windows default app for the current data file. For example, in Example 8 of the User Guide, the data file is grnt_fem.sav, so if you type the shortcut key ctrl-u, Amos will try to run SPSS Statistics to open grnt_fem.sav. Then you can use SPSS Statistics to edit or analyse the data. This assumes that you have SPSS Statistics installed. If you don't have SPSS Statistics installed, Windows will ask you what program you want to run.
Clicking File→Run Default App has the same effect as double-clicking the data file in Windows File Explorer. For an R data file, Amos will try to open the R program. For an Excel file, Amos will try to open Excel. For a text data file, Amos will typically open a text editor. And so on.