As you have a plain install you should bare in mind a few things.
If you need a CD key you don't have the final version of UT because the need for a key was removed.
Make sure you have installed the final v436 NODELTA patch if you did need a key.
You will only be seeing half of the total amount of hosted servers because the main UT config lists old obsolete masterservers.
You need to edit the file "unrealtournament.ini" and replace the dead web addresses with working ones.
Instructions here ->
http://333networks.com/instructions
(the mastersevers are listed in the UT config in 2 places. Change both sections or just the second section further down the config.)
Your previous issue with textures crashing the game is likely because you installed the compressed textures from CD 2 (or with a map from somewhere else) but did not enable support for compressed textures in the game ini file (it is off by default and is not an option in the game menus).
The original video renderers in UT were made for DirectX 5 - 7 era graphics cards (Windows 95/98) which also cannot display modern larger alternative textures now available.
Hermskii pointed you at the old update for cards that use DirectX 9. If you have an AMD/ATI or Intel graphics chip your should use the actual DirectX9 renderer which is available on the authors page
https://www.cwdohnal.com/utglr/
The OpenGL renderer for UT does not behave properly with AMD graphics cards, and the GFX memory on your card will be ignored.
Intel disabled 2 hardware 3D functions so they use software emulation.
Note: if you are using a laptop, the RAM in the PC will be shared with the GFX chip so the AMD issue stops being an issue, so either renderer is fine.
There are also newer renderers for modern GFX chips that use DirectX 10 and 11
Windows dropped hardware support for below DirectX 10 since Windows 8 (maybe earlier) so you must run the DirectX 9 installer from the Microsoft site to add HW support back.
If you use Steam on the same PC and have installed older games with it, there is a good chance you have already installed the required files.
If you have an HTML file you can't open, then it is either corrupt or not an HTML file.
There is no such thing as an Explorer web browser file, so you either mean a shortcut to a web address, or a saved web page.
Whatever your default web browser is will claim ownership of any web type links and files.
As Hermskii says, ignore it as it is not part of the mod that is used. it will likely just be extra info.