I put the DumpVidoe.exe in the Captivate 5.5 installation directory (the Externals.txt file has the correct location), opened the Converter, chose a swf to load (a very small, basic animation with about 2 dozen frames), then nothing happened. However, I did notice that in the output directory there was a new swf with the same name as my original but with a '_temp' added to the end (eg. 'myfile_temp.swf'). Any direction would be appreciated.
Okay, I figured out that when you publish the swf, there is an option to 'Enable SWF for conversion to iPhone application,' which must be selected for the Converter to process the generated swf.