Julia code to make a Windows 95 key, created for an installation running in VirtualBox under a registered copy of Windows 10.

win95key.jl

""" from C code at https://github.com/stonesword0/win95-key-generator """

usage() = println("\nUsage:\n\n-h, --help, -help - Displays the help\n-o, -oem - Generates a Windows 95 OEM Key\n-cd, -cdkey - Generates a Windows 95 CD Key")

function win95cdkey()
    chunk1 = rand(100:998)
    if chunk1 in [333, 444, 555, 666, 777, 888]
        chunk1 = 635
    end
    chunk2 = [0, 0, 0, 0, 0, 0, 1]
    while sum(chunk2) % 7 != 0
        chunk2 .= rand(0:8, 7)
    end
    println("\nKey: $chunk1-", join(map(string, chunk2)), "\nThanks for using my program!\n")
end

function win95oem()
    chunk1 = rand(001:366)
    chunk2 = rand(195:203) % 100
    chunk4 = [0, 0, 0, 0, 0, 9]
    chunk5 = rand(10000:19000)  
    while sum(chunk4) % 7 != 0 || chunk4[6] in [0, 9]
        chunk4 .= rand(0:9, 6)
    end
    println("\nOEM Key: $chunk1$chunk2-OEM-0", join(map(string, chunk4)), "-", chunk5)
    println("\nThanks for using my program!\n");
end

function main()
    if length(ARGS) != 1
        usage()
        println("\nNeed exactly one argument after script name (-o or -cd, for example). Try again.\n")
    else
        arg = lowercase(ARGS[1])
        if arg in ["--help", "-help", "-h"]
            usage()
        elseif arg in ["-o", "-oem"]
                win95oem()
        elseif arg in ["-cd", "-cdkey"]
                win95cdkey()
        else
            usage()
            println("\nIncorrect argument supplied. Please try again.\n")
        end
    end
end

main()