What kind of language is this and where to get more help about it ?

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Windows

What kind of language is this and where to get more help about it?
I know for sure it is Windows related.
I am not sure if it is batch programming either.
I have --some-- files, 2 or 3, in my PC from very old times, when I played with God knows what. I managed to collect and make a small list of possible permissible scripts like in the example I provide. I actually had to --guess-- how to add a space to a filename that contains spaces in it to make it work. I spent probably 1 week of different permutations and in the end, I managed to find a way.

But it will be cool if I will actually get a help document, where more expressions can be written and used.

So practically, make any type of file you want, with any extension you want, insert this code and run it. In my case, I have some editors, like "metapad" that can automatically recognize a link in the text and by double clicking on it will execute the link.
Thank you!

What I have tried:

%20 = space
file:\\C:\a.txt
file://C:/a.txt
file:///C:/a%20a.txt
file:///D:\Programe\PrimNecesare\zElectronica\Proteus\Save\Display\7segmentDisplay\4033%20for%207%20segment%20display%20v2.pdsprj