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Am confused... the Files App is new to iOS 11... are you talking about the old iCloud Drive? I am on iOS 11.03 (most current, and the (new) Files App in iOS 11 has NEVER worked for me because Google hijacks all MS file types (.xlsx, pptx, and doc).
Apologies, just edited my post to say "11.1", not 10.1. I was having this issue with all Office file types up until installing the beta that came out this past Monday.
 
Am confused... the Files App is new to iOS 11... are you talking about the old iCloud Drive? I am on iOS 11.03 (most current, and the (new) Files App in iOS 11 has NEVER worked for me because Google hijacks all MS file types (.xlsx, pptx, and doc).

I am on iOS 11.0.2 and Google Drive no longer opens files from the Files app into Google Drive's app, except Google's own file formats, docs, sheets and slides. Even a Word document on Google Drive now shows a preview from within the Files app.
 
I am on iOS 11.0.2 and Google Drive no longer opens files from the Files app into Google Drive's app, except Google's own file formats, docs, sheets and slides. Even a Word document on Google Drive now shows a preview from within the Files app.

I think you misunderstood. I have the Google Drive, OneDrive, and Dropbox apps.... they all three show up as ‘Locations’ in the new Files App. I am able to open ANY file from the Google Drive location.... what I am NOT able to do is open any MS Office files from the OneDrive or Dropbox locations... instead, it takes me to the google Drive location and asks if I want to save the file there (I don’t... but it actually doesn’t save it even if you select the option to do that). Bottom line: Google Drive itself works fine but there is something that hijacks MS Office files from OTHER locations - rendering them useless in the Files App. Side note: I am able to open files directly from the OneDrive and Dropbox APPS... just not those ‘locations’ within the Files App.
 
I think you misunderstood. I have the Google Drive, OneDrive, and Dropbox apps.... they all three show up as ‘Locations’ in the new Files App. I am able to open ANY file from the Google Drive location.... what I am NOT able to do is open any MS Office files from the OneDrive or Dropbox locations... instead, it takes me to the google Drive location and asks if I want to save the file there (I don’t... but it actually doesn’t save it even if you select the option to do that). Bottom line: Google Drive itself works fine but there is something that hijacks MS Office files from OTHER locations - rendering them useless in the Files App. Side note: I am able to open files directly from the OneDrive and Dropbox APPS... just not those ‘locations’ within the Files App.

Oh, I got you. What I am saying is that since a week or so, I no longer have the behaviour that you describe. I used to have it too, and even removed GDrive for a while, but it somehow got resolved. Not sure how - either an iOS update or a GDrive update.
 
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