2) The UT2003 button is not exactly like the other 4 buttons in terms of quality and the yellow border
3) The 2 new buttons will be greyed out by default, you need to run the reg file of your choice in the Reg folder and that will enable the buttons that you wish to have
NOTE: If you have not installed all 4 games, upon applying the registry file of your choice all the default 4 games will have their buttons 'unlocked'; however, this is easy to fix, just edit the registry file of your choice and remove the name of the game, save & then apply said reg file
1) Install Unreal Anthology
2) Run eGo's UA Patch Tool
3) Extract archive to the Unreal Anthology directory, normally it's C:\Unreal Anthology (Make sure to overwrite the files upon extracting, otherwise it won't work correctly!)
4) Go to the Reg folder inside AutoRunData, and run the registry file of choice -- NOTE: there are 3 version of each reg file per architecture (32-bit & 64-bit, respectively); XMP = enables the U2XMP button, 2003 = enables the UT2003 button, XMP-2003 = enables both the U2XMP & UT2003 buttons
Unreal Anthology is a collection of all the Unreal games and the launcher helps you launch each game easily. All Ronin did was modify the launcher. I don't have it and I don't need it as I have Unreal Gold, UT99, and UT2004 non-Anthology versions (and UT3 and Unreal 2 but those games suck). It's not strictly for Linux.
WinZip (you would have to buy it... trialware garbage), IZArch (is free, don't have to buy it), and 7zip works. I use IZArch personally.