I have been wanting to stream this game with some friends, so I have been trying to get it into a windowed mode. I have successfully been able to pull this off by pressing Ctrl+F12, but there is now the issue that the game will not let me move forward and backward. I have tried changing the buttons to buttons other than the up and down arrows, but that did not work. All other controls work just fine, the game simply forbids me from moving forward and backward.

Is there a way to fix this, or is there a more efficient way of putting the game into a windowed mode that does not come with this issue?

I had already tried hitting the Alt key and it did not work. Changing video synch also did not work, I tried to change to OpenGL but it said it could not play at the current resolution.

I am trying to play the game on a Windows 10 Pro.

I have also tried to make a batch file and it also does not work, but I think it is simply because I am doing something wrong. I have written [wiz8InstallDir\wiz8.exe /windowed] in a text file and converted it into a batch file, and nothing happens when I click on it.

After a lot of troubleshooting, I finally got it to work after selecting DX6 and deleting openGL. Thank you for your help.

Good to hear it works!
If you still run into similar issues, e.g. to get up the stairsteps of the 2 buildings at Umpani Base,
limit the fps to 30, and/or run into them while slightly looking up
(hold Rmb and adjust cam at least 30degree upwards, then use shift+arrow_up to move).

p.s.
pardon me for my mistake, the starting parameter must be [/ window], not [/ windowed]!

If that still does not work i would assume you also put the square brackets into the batch file?
They only encapsule the actual command string and dont belong into the batch file.
Btw if the batch file is placed into the games main folder, along with the exe,
the [wiz8installdir\] part is not necessary, so [wiz8.exe /window] would be sufficient.