Since there is no public information related to this procedure, I would recommend classic Windows renaming. Select the files, press F2 and then you can load them up in Yardi Classic. I visited the official website, but couldn't find anything about it. Also, go to Help > Contents and read the available documentation.
If at this point, this procedure is not available then you can use the following link to obtain support: http://www.yardi.com/about-us/