I asked if AVCHD files can be played on Mac and the support site says to simply click on the icon and quick time will play it. A big lie. Just say it won't support the file type and tell us what apps to get.

I also had issues opening AVCHD files on case-sensitive filesystems.

You can try these steps to solve the issue:

1. Right click on the AVCHD file and select 'Show Package Contents'
2. Right click on the BDMV file and select 'Show Package Contents'
3. Rename index.bdm to INDEX.BDM (it seems that all files in the BDMV folder should be in UPPERCASE for Quicktime to open the AVCHD file).
4. Go back twice and try again to double-click on the AVCHD file (Quicktime should open a window showing the multiple clips, as expected).

I have the same issue but I can't 'Show Package Contents' any longer because the AVCHD is showing already as a folder I can see but the BDMV file is showing as Document... So there's no 'Show Package Contents' for it and I can't open it with anything!

Do you have any suggestions?!

Just a note that It was working perfectly and showing as Quicktime Icon until I opened it with Quicktime once and then closed Quicktime.

Did you find the solution to this? Im dealing with the same problem here...

You might want to consider starting a new discussion. Since this one is a couple of years old, less people are likely to look at it. A new post would be much more visible. You can link to this one.