One common used viewer is humviewer. there are several others but lets start with humview. It does not take any conversion programs..
You install on your computer and then put your recording (sd card) in your reader. It goes better if you copy the recording to a file on your computer...
I will be right back with a couple of other hints..
OK. you can go here to get humviewer. the latest is 67 I think..
http://humviewer.cm-johansen.dk/It is free.
Once you have it down loaded let us know and we can talk you thru the usage..It is real simple..
Chuck