Need help... it suddenly wont start...
it says

------- Input Initialization -------
Joystick is not active.
------------------------------------
Loading global strings
----- Client Initialization -----
CPU: Unknown, Frequency: 2496 Mhz
Physical Memory: 2048 mb
----- Initializing Renderer ----
----- R_Init -----
Initializing OpenGL subsystem
...initializing QGL
...calling LoadLibrary( 'C:\Windows\system32\opengl32.dll' ): succeeded
...setting mode 9: 1600 1200 FS
...using colorsbits of 32
...calling CDS: failed, bad mode
...trying next higher resolution: failed, bad mode
...restoring display settings
...registered window class
...created window@0,0 (1606x1235)
Initializing OpenGL driver
...getting DC: succeeded
...GLW_ChoosePFD( 32, 24, 8 )
...219 PFDs found
...hardware acceleration found
...PIXELFORMAT 11 selected
...creating GL context: succeeded
...making context current: succeeded
...WARNING: fullscreen unavailable in this mode
...setting mode 9: 1600 1200 FS
...using colorsbits of 16
...calling CDS: failed, bad mode
...trying next higher resolution: failed, bad mode
...restoring display settings
...window already present, CreateWindowEx skipped
Initializing OpenGL driver
...WARNING: fullscreen unavailable in this mode
...shutting down QGL
...unloading OpenGL DLL
...assuming '3dfxvgl' is a standalone driver
...initializing QGL
...WARNING: missing Glide installation, assuming no 3Dfx available
...shutting down QGL
----- CL_Shutdown -----
-----------------------
GLW_StartOpenGL() - could not load OpenGL subsystem

Refer to my post in these forums to run the game in DX12...itll solve all your issues...infact ill link it for you

https://www.gog.com/forum/star_trek_elite_force_ii/star_trek_elite_force_ii_in_dx12solve_all_your_graphical_issues_here

Try following the 7 steps in this post.

https://www.gog.com/forum/star_trek_elite_force_ii/glw_startopengl_could_not_load_opengl_subsystem

If this does not help you you need to give more information as how it happened that you got this issue.
Did you change something ? Install a Mod ? Something must have changed if it worked before.

why give up on a solution to an obviously big problem?

seriously if thats how you feel then mayb we should as a collective community just give the entire franchise a complete rest and let it stay busted

You trying to make people download your Tool does have nothing to do with how to fix the Occurring OpenGL issues.
They can with far less effort and very safely follow the provided instructions to fix the issue.
They need not to download a 3rd Party tool that is of unsafe origin of which you can't tell exactly what it does.

Help people by focusing on the immediate problem they are having and not by making them download and go trough a very time consuming routine to change the way the game is displayed with potentially unsafe tools.

Did you switch to another resolution? It seems that with your display type, the resolution is not supported in fullscreen.

There are ways to work around this. However it would be appreciated if you could share a little more info here.

For example:

your native screen resolution
your GPU Model
your config file located in BaseEF folder

yourwindowsusername.cfg

with that it should be possible to get it back into a working state and if necessary create the correct conditions with the GPU driver software settings as well.

While the wrapper solution proposed earlier might work around this issue - it is prone to not being on par feature wise when it comes to all the rendering calls made - as well as possibly different interpolation of light / shading.

Regards

yes its so unsafe that its even referenced on pcgamewiki...all over that website.