The use of the externalSD card is different between apps. Some reader programs (Aldiko, for example) can read content from the extSD without and hassle. Movie players are often the same. However, very few of the built-in apps use the extSD that way.
If you have a certain type of content that you want to read from the extSD, just post what the file-type is and I (and the other here) can try to recommend an app for that.
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