by Tvangeste » Mon Sep 23, 2013 8:59 pm
*_abrv.dsl - abbreviations for the appropriate dictionaries
*.ann - annotations for the appropriate dictionaries
*.bmp - icons for the appropriate dictionaries
*.dsl.dz - compressed main dictionary
rtf, txt - for your information only
defconfig - have no idea what's there
speech.lsa - audio pronunciations for the Lingvo Universal dictionaries
P.S. abbreviations and annotations are optional, you can live without them, but they are typically very small and it is recommended to keep them for the completeness sake.
P.P.S. If you really, really, really serious about removing everything, just keep the *.dsl.dz files, that should be enough.