Can android apps be repackaged to remove unused assets only needed for initial setup ?

For instance if a app has included "demo" tutorials inside can they be safely "touched" or removed without causing instability in a general sense ?
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James BilousConnect With a Mentor Software EngineerCommented:
You can modify an APK all you want but you'll need to know specifically which files you are looking for in order to remove them without damaging functionality. You could always make copies and use trial and error.
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