Read this question and answer. it will tell you what is the file extension rsm
http://ask.brothersoft.com/what-is-the-file-extension-rsm-91855.html
And then post back the file you got.
Or you may try this below to turn .rsm file to your word document:
http://ask.brothersoft.com/how-do-i-convert-an-rsm-file-extension-to-a-word-document-119749.html