can't add an attachment to job application?

[Chris]

So im at the application sight online and it says to add an attachment. I click that it sends me to my files where I can choose my resume file run by abi word. Then I click add and I get an error message from the application sight that says [attachment type abw is invalid your resume/cv must be in text. doc or docx format.] Could it be the word document program im using? I tried to write simple text on a file to test the text format it referd to and upload it but it said the same thing. Does anyone no whats going on with this problem im having? please im just trying to make money for my poor family : (