MTS files are high definition from a camera that was made LONG after version 3 - you need to buy the new version
Premiere Elements has a 30 day trial
Dear Mr. John,
Does version 13 of Adobe Premier Elements support MTS files?
Premiere Elements 13 supports MTS files.
Premiere Elements Team
Your files probably are ones that use AVCHD (MPEG4 AVC/H.264) video compression and the .mts file extension (which is referred to as a container format).
Putting the file extension aside for the moment, I believe it was not until Premiere Elements 7 that Adobe supported files that use AVCHD video compression.
AVCHD is a resource demanding format, and your Premiere Elements 3.0/3.0.2 is only a 32 bit application which has resource implications.
What is your computer operating system? Premiere Elements 13 does not support Windows XP or Vista. And, Premiere Elements 13 Windows is only a 64 bit application when it is run specifically on Windows 7, 8, or 8.1 64 bit. That has lots of resource implications.
I do not recall the Sharing opportunities in Premiere Elements 3.0/3.0.2, but you could consider converting what I believe to be your AVCHD.mts into a MPEG2.mpg file and then trying to import that into your Premiere Elements 3.0/3.0.2 project with the most appropriate project preset available.
Please review and consider.