* doc-view.el (doc-view-set-doc-type): New function refactored
from doc-view-mode. (doc-view-fallback-mode): New function. (doc-view-mode): Use it. (doc-view-mode-maybe): New function that checks if doc-view-mode can be used and falls back to the next best mode otherwise. * files.el (auto-mode-alist): Use doc-view-mode-maybe for PDF, DVI, OpenDocument, and MS Office files.
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