I found a work around for this if you can stomach a pdf. It will return a file that is not corrupted but it will be in the pdf format.

//call the api to generate word document
try{
  url = alwo_worddocgeneration.GenerateWordDocument({Word Template}, tools,"{Primary Page Class}",null);
  docFilePath = tools.findPage("pxProcess").getString("pxServiceExportPath") + pega_rules_string.whatComesAfterLast(url, '/');
  java.io.DataInputStream tempSourceInputStreamGeneratedFile = new java.io.DataInputStream(new PRInputStream(docFilePath));
  //convert word doc to pdf
  org.docx4j.openpackaging.packages.WordprocessingMLPackage wordMLPackage = org.docx4j.openpackaging.packages.WordprocessingMLPackage.load(tempSourceInputStreamGeneratedFile);
  //Converting above input stream to output stream 
  java.io.ByteArrayOutputStream tempTargetOutputStreamGeneratedFile = new java.io.ByteArrayOutputStream();
  org.docx4j.Docx4J.toPDF(wordMLPackage, tempTargetOutputStreamGeneratedFile);
  //Converting above OutputStream to byte array and then encoding it
  byte[] byteArrayFinalFileSource = Base64Util.encode(tempTargetOutputStreamGeneratedFile.toByteArray());
  //Converting encoded byte array to string
  strFileData = new String(byteArrayFinalFileSource);
}catch(Exception e)
{
  oLog.error("Error in generating the document");
}

The GenerateWordDocument function correlates to pzGenerateDocument its just usable in my current context. So you may have to save as it. As far as the rest of it goes all you have to do after this to make it into an attachment is make a new attachment page and set the source for the file to the local variable strFileData (you will have to have this in your activity). You will also need a word template to use.