I can see that both of these options can't be accessed. Is it because the game uses glide? Is there any way to enable these options?

I have the same issue. I hope there is some way to access these options.

As far as I remember it could be changed to Direct 3D in the CD version. Wonder why they lock it to Glide.

Can the GOG version run in a DirectX or OpenGL mode?

Just Glide it seems, & I can't change the res either but otherwise it works & works well

So there is absolutely no way to have nGlide run in a window? It just seems really odd that that option would be missing.

not that I can tell but if you download nGlide you can use the the Configurator to stretch the image to fit your screen if you want

I tried renaming szHardware file and then running the game. It enables the use of other rendering options instead of glide. True color textures & bump map also became available then. The only problem I have then is that the game is stuck in 640x480. I tried to fiddle with the options in the new szHardware file the game created after renaming the other one, so far no luck in getting any other resolutions.

No idea what they did there. In the original version you could change resolutions, but it didn't have widescreen resolutions as far as I remember.

You can change the resolution. Go to All Programs>GOG.com>Slave Zero>Tools>nGlideSettings.

The problem is that GOG version forces the use of nGlide, which doesn't allow to turn on the bump mapping (game looks a lot better with this function on). THAT IS A GREAT SHAME.

Not that better because the bump mapping is only on the player character, but it would be nice to have the graphics options and resolutions changeable in the game like it was possible in the original and not be forced to use NGlide. Plays quite nice nonetheless, the CD version doesn't work on Windows 7 and 8 (just found that out because I switched to Win 7 in late 2013, hadn't tried Slave Zero on it so far). Confirmed. Somehow deleting the szhardware.ini locks the display resolution to 640*480. Options can be changed in the option menu, but changes aren't kept. Setting other modes as nGlide also isn't possible, the game always jumps back to Glide when you click "Apply changes". Hope gog will fix these issues.

The game tries to autodetect available rendering modes and resolutions when it doesn't find a complete szHardware.ini file (I think this is done first run on the CD version of the game but it sounds like GOG distributes one with the game - probably because the nGlide renderer is much more likely to work correctly).

The autodetection might not work correctly on new hardware and operating systems, so resolution options you would normally have may be unavailable and options that don't work at all might appear.

In my case (CD version), "Primary" and "Secondary" renderer (Direct3d) modes work, but only in 16-bit colour - trying to select 32-bit colour results in the game reverting back to the last working resolution selection (attempting to force 32-bit colour by editing szHardware.ini has the same result).

Trying to select an 8-bit colour mode also reverts back to the last working resolution :P

EDIT: Just noticed something annoying (might not affect the GOG version): the crosshair becomes increasingly mis-aligned (down and to the right of where it should be) as you increase resolution above 640x480. This seems to affect both Direct3D and nGlide - but with nGlide you can avoid the issue by selecting 640x480 in-game and using the nGlide Configurator to make the game run at whatever resolution you want.

640x480 selected in menu
1024x768 selected in menu

Remember you can contact Support about these issues.

the cd version runs on windows 7.
the only thing is, that you need to work around the copy protection.

but in my case the gog version looks graphically better than the cd version.

Same on my side. Not all graphics options work, but the CD version's native Direct 3D also seems to work worse with my current graphics card than with the last one I had (a Radeon HD 3450). There are definitely graphical errors with the native 3D mode (primary) on the CD version (not the gog one). So it's an improvement, but could get even better if bump mapping and the high colour textures would work.