I wrote this EnScript for myself to essentially create a separate Logical Evidence File with all the user generated files to simplify review. It is a modification of the EnScript here that exports files based on extension.
To use, simply run the EnScript and it will prompt you for a list of extensions, by default most of the common user generated extensions are already included, but you can add or remove extensions from the list.
Once run, it will grab every file that has an extension in the list you provided and then create a LEF with just those files, maintaining their original paths and metadata. The files are placed in the LEF in a folder corresponding to their extension, making review easier. If you check the first box, the LEF will automatically be loade dinto EnCase after its created. The second one causes all compund files to be automatically mounted. Office files, Zips, Thumbs.db, etc. will all be mounted to reveal their contents and additional metadata.