I hope this is the right forum for this.
Basically I have a 1.4G QuickTime movie of a music video that I need for my showreel. It was created on an older Media 100 system by an editor who I am no longer working with. I can
You probably should have posted in the Media 100 i forum. But no problem with that.
To your question: right now there is no free Media 100 i codec, which you would need to read the media file in a 3rd party QuickTime app, like FCP.
The codec is included in e.g. Media 100 Producer (software only) or the Aja-based Media 100 systems. So if you want to use this media file you probably should think about maybe getting Producer.