To use the exporter, you first need some particle data.
Set up the scene, run it for however many frames you wish and then call up the exporter dialog box.
Remember that this process is not a cache; it takes a snapshot of one frame of particle data.
You don't have to export all possible particle data; it is likely that the importing application can only handle some of it and would be confused if unwanted data was exported.
With this in mind, the first thing you need to do is decide which data needs to be exported; for that you will need to see the documentation of the importing application.
The data export dialog has two lists: Available Fields and Export Fields.
The fields in the Available Fields list will not be exported, they are the data items which you can export if you want to.
To export a data item, select it in the Available Fields list and click the button marked >>>> to move it to the Export Fields list.
Note: The three position fields are already in the Export Fields list as it is highly likely you will want to export the particle coordinates.
If you decide not to export a field after all, simply select it in the Export Fields list and click the button marked <<<< to move it to the Available Fields list.
The field will be moved back to the bottom of that list.
The importing application may expect the data to be in a specific order.
You will need to establish the expected order and arrange the list in the Export Fields list accordingly.
To re-order the list, select the field in the Export Fields list and use the Move Up or Move Down buttons to change the field position; repeat with any other fields which need to be changed.