plagarism checker databases like turnitin lack the ability to parse anything but word files
I didn't believe this statement so I looked it up.
According to their student guide at http://www.turnitin.com/resources/documentation/turnitin/training/en_us/qs_student_en_us.pdf
At the top of page 2:
" We accept submissions in these formats: MS Word, WordPerfect, RTF, PDF, PostScript, HTML, and plain text (.txt)"
So while I think plagiarism checkers are kind of a waste of resources, your statement is still false.