ASCII fixed width (.TXT), dBase files (.dbf*), Microsoft Access files (.mdb), Microsoft Excel files (.xls) and comma delimited files (CSV**).

*  With dbase files MAILERS+4 can open up dbase 3 & 4, visual fox pro, and ACT 3.0 files.

** Comma delimited files are converted to dbase 3 upon opening the file in MAILERS+4.