indesign cs5.5 plugin issue

I have indesign cs3 with xmpie, it is a utility that does variable data. I am now on cs5.5 and every time I open a document that I worked on in indesign cs3, I get a missing plugin error and the file turns into a read only document with [converted] at the end of the file name. It is really annoying whenever I try re-saving the file.  Is there a way to get rid of this.