An EXT file may be sent by an automated emailing script or program; using the generic filename filename.ext (the file’s name and “ext” for “extension”); may be a file created in one of many text or binary formats.
When you receive an EXT file as an email attachment, it is generally not clear what the true file format is. It is best to contact the sender of the email to determine the file contents to help with finding an application that can read it.
Many automated emailers on the Web use a generic string “filename.ext” when referring to the email attachment. It’s possible in some cases the script author did not replace the filename string with the appropriate attachment filename when sending the email.
It’s better to use the true file extension like CSV, DOC ,XLS. TXT, PPT or any one of a hundred others.
If you are looking to send as/400 data it can be done a number of ways and in many file formats. You can import the data into Excel using the addon and create a CSV , XLS you can write a script or app in c# or VB to do the extract and build a file..
More specific details are needed for thing like what is going into the file, select records, entire file. What is the recipient going to do with the data, will it be used in a PC environment or used on another as/400? If that is the case you could just create a SAVF with the data and they can do a RSTOBJ to get the file data. You just need to remember to set the version parameter if they are on a different IBM OS.