ðɪs fˈaɪl tˈaɪp wʌz jˈuːzd ɐmˌʌŋ ˈʌðɚz baɪ wˈɜːd stˈɑːɹ kənsˈɪstɪŋ ʌvðə mˈeɪn ˌɛksᵻkjˈuːɾəbəl dˌʌbəljˌuːˈɛs.sˌiːˌoʊˈɛm ænd ðɪ ˌoʊvɚlˈeɪ mˈɑːdʒuːlz dˌʌbəljˌuːˌɛsˈɛmˌɛsdʒˌiːˈɛs.ˈɑːvɚ, dˈʌbəljˌuːsˈɑːvli wˈʌn.ˈɑːvɚ, meɪlmˈɜːdʒ.ˈɑːvɚɹ ænd spˈɛlstɑːɹ.ˈɑːvɚ, wˈɛɹ ðə "fˈæt" ˌoʊvɚlˈeɪ fˈaɪlz wɜːɹ ˈiːvən bˈaɪnɚɹi aɪdˈɛntɪkəl ɪn ðɛɹ pˈoːɹts fɔːɹ sˌiːpˈiː slˈæʃ ˈɛm ˈeɪɾi sˈɪks ænd ˌɛmˈɛsdˌiːˌoʊˈɛs, dˈiː bˈeɪs, ænd ðɪ ɛnˈeɪbəl dˌiːˌoʊˈɛs ˈɑːfɪs ˌɔːɾəmˈeɪʃən sˈɔftwɛɹ pˈækɪdʒ fɹʌm ɛnˈeɪbəl sˈɔftwɛɹ.
This file type was used among others by WordStar (consisting of the main executable WS.COM and the overlay modules WSMSGS.OVR, WSOVLY1.OVR, MAILMERGE.OVR and SPELSTAR.OVR, where the "fat" overlay files were even binary identical in their ports for CP/M-86 and MS-DOS), dBase, and the Enable DOS office automation software package from Enable Software.