Decoding video files

Job ID: 31065759

Budget: $10 – $30 USD

Hello,
I want a tool/method (preferably developed in Visual Studio) that's able to extract/decode the video out of the provided files.
It is supposed to be a 5min or so video. There's an index file with some information in it (probably the encryption key).
I have other examples on the same format, but the sizes are too big to upload here.
The idea would be having a tool where you point to the index file and then extract the data from the other files into a single video file.
Thank you.