I have run this application for quite some time under a default installation of WINE and now under CXoffice 3.01. It has always worked perfectly for me.
The only catch for cxoffice is that I couldn't seem to install it via the cxoffice install procedure...maybe because the program download for convert is just the executable and not an installation file. I just run it from the command line (or a script file) using the wine binary cxoffice installed.
Dave