If your files are from a camcorder and in the original directory structure of the camcorder, iMovie will import them directly. If the files are removed from their context, you may need a converter. The two converters I am aware of are ClipWrap and VoltaicHD. Both of these work well. There are several free alternatives as well, but I am not aware of which are the good ones.
I have never heard of Wondershare, so I can't say anything good or bad about it.
Currently Being ModeratedOct 1, 2013 7:22 PM (in response to AppleMan1958)
My predicament is that I now have the AVCHD files on a disc which is read by my iMac DVD Player when i put it in.
However I dont know how to save it to my iMac desktop cause it doesn't recognise the AVCHD format.
Is it possible to play the disc through iMovie and then, file save as?
Can you open your DVD disk in the Finder? If so, do you see folders like VIDEO_TS and AUDIO_TS? If so, then at some point you have converted your AVCHD to a standard definition DVD (640x480).
You can import a standard definition DVD into iMovie using the instructions here.
Do you see folders like DCIM, MISC, and PRIVATE? If so, the folder structure of your AVCHD is likely intact and you can import the AVCHD to iMovie. With the DVD disk inserted in the drive, use FILE/IMPORT FROM CAMERA in iMovie. This disk should also be playable on a BluRay disk player (but not on a DVD player). It would not be playable on a Mac unless you have a BluRay capable disk drive and some BluRay player app.