my dear friend
Windows alone is not enough, you need such peripherals
Use the K-Lite Codec Pack. After installing this item, you should not have any problems
The function of this package is to be able to run relevant codecs such as mp4 in Premier Pro
I see no need to worry about those meta data or why you should remove them.
Pantry and Ingredients tags refer to asset tracking. In fact most of this data are production related and not relevant in any way for a consumer. The rest tells you about technical features, like the resolution or video codec.
A watermark is something different. If you want to ...
At best, you can use the software Handbrake
It greatly reduces the video volume and has little effect on the quality. In this software, make changes to the resolution section and other items. I'm sure if you test a few times you will notice its very good performance and this software is free.
Try TMPG Smart Renderer https://tmpgenc.pegasys-inc.com/en/product/tmsr5.html
If anything is recoverable, this tool should work. If it can't pull anything from the file, I don't know of any other tool that would. The trial version should work fine for you to get what you need.
I do that all the time.
You can use
https://github.com/mifi/lossless-cut (Open source)
SolveigMM Video Splitter (Paid)
Both can merge files and keep the tracks by default. Takes seconds/minutes depending on your system.
The only video editor (in my experience) where I could edit the video/merge and still keep the subtitles was Power Director (paid).