Compressed XFDL files are compressed using a modified gzip
format; this format is unique to the Designer. You cannot view a compressed file in a text editor, but you can use the form in the Viewer, Webform Server, and the Designer. Additionally, other compression software may not be able to decompress the forms.
Compressing forms on saveParent topic: Developing forms
You can set your form so it is compressed when the user saves it. Setting file compression is done in the Advanced IBM
® Forms Designer Perspective.
Compressing forms when submitted
You can set your form to compress once the user submits it. This involves creating a submission button and setting its properties in the Advanced Designer Perspective.