Hi @julioarriaga - Sorry, I don't really understand. You showed a screen shot of aspx files you cannot access but then say they are Excel files.
I think the SitePages is a special area of sharepoint - not really for user data. Perhaps your Excel files are in 'Shared Documents' or somewhere else and you need to adjust the 'Folder' parameter. If they are Excel files I would expect them to be listed as such in that table.
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