MC6 says "invalid file name" when trying to import .mov (DNxHD converted from AVCHD)

I have AVCHD camera and I’m using MC6 and AMA. Before I had my workflow down, I copied-n-pasted AVCHD files from my SD cards to my HDD.

Although I was able to play these files using VLC player, I’m unable to link these through AMA, and on an ASC I was told the reason AMA won't recognise them, is because they are not on an SD card anymore; I didn't ingest them properly from the card (therefore without Transcoding them to DNxHD through Avid). Avid support suggested I use Squeeze to converter these AVCHD files to DNxHD .MOVs to remove the interpolation. Great!

I didn't appreciate that Squeeze 8.1 doesn't do this out of the box and the plug-in is $99, therefore I looked around for a cheaper encoder and found Aunsoft AVCHD encoder had great reviews and was much cheaper. I then used a trial Aunsoft to converter my AVCHD files into DNxHD .MOVs.

However, now that I’ve converter the files, Avid doesn’t want to import them displaying error message, “Invalid file name”, not sure why because they have .mov postfix as they are supposed to..?

I’ll buy Squeeze AVCHD to DNxHD plug-in if necessary, but I am worried in case after another $99 I'll experience the same problem?

Any one know what’s happening?

Kind regards and thanks in advance
Antony

2 x Sony NEX-FS100E's
Mac Pro (early 2009) 2 x 2.66GHz Quad-Core Intel Xeon "Nehalem" processors, 12GB of 1066MHz DDR3 ECC memory, 2 x NVIDIA GeForce GT 120 with 512MB GDDR3 memory. Mac OS X Lion 10.7.4.
Avid Media Composer 6.0.1, Pro Tools 10,