How to work with dBase .dbf - .dbt ?

I need to connect some dbase-Tables as readers - but in some of them there is also a .dbt file (because these dbase-tables are export-files from another program and in the original data are some memo-fields including more than 254 characters). Unfortunatly FME does not work with this type of data? When I add those dbf tables as readers, FME stops to process them . The only way to work around I figured out by now is to convert the dfb to an excel-file with Excel itself.