Im super excited to see this in action, hopefully we can get it to run. Thanks for getting back to me. It's a Dell Latitude E6410. 2.4Ghz processor, 4mb RAM, Windows 10. I believe it's running 32 bit? (I'm a Mac guy and only have the PC for running Estlcam). I know how to find stuff if you tell me what you need to know and kinda how I can find out. I saw some references to graphics processor issues but not sure what this machine has inside.
Well looking at your machine's specs it should be plenty capable of running PixelCNC. The OpenGL rendering function error is a red flag to me indicating that something specific to the Windows installation on your machine is not properly configured, or that some kind of software is interfering with normal program operation. The function the error mentions, 'glActiveTexture', is something that 20 year old graphics hardware supports, so it could very well be a driver issue with your system.
The problem with Windows complaining about not knowing how to open a common everyday program EXE file indicates that something has taken the liberty to interfere with your Windows installation. It could be a virus, antivirus, or some adware/malware that tried to work its way into your system, or possibly has worked its way in.
Since it looks like PixelCNC did eventually run, in spite of the "search for an app" problem, and wasn't able to properly initialize OpenGL, I think there's a good chance you can at least get it running if you update your drivers. I suggest you visit the driver page for your machine and have it automatically detect which drivers to download. The important one you're going to want to get PixelCNC running will be a video/graphics driver. Your specific laptop model came in two flavors, apparently, one with Nvidia graphics and one with Intel HD graphics. Either one should be able to run PixelCNC.
The driver page should be able to automatically determine if you need the 32-bit or 64-bit version of the drivers, just click the "Detect Drivers" button: https://www.dell.com/support/home/us/en/04/product-support/product/latitude-e641...
It should show you a list of drivers specific to your laptop, and you could go ahead and download all of them and get your system properly setup, but if you want to just quickly skip to seeing if you can get it working then download only the graphics driver that it shows you, it will either say Intel HD, Intel GMA, or Nvidia, depending on the actual hardware you have. It will also likely say "graphics" somewhere in the name. Go ahead and download/install that, reboot, and try running PixelCNC again. You will probably encounter the same "search for an app" issue, but once you get through that PixelCNC should startup, if it managed to show you the glActiveTexture error before - which means PixelCNC did actually start at some point.
I did manage to find this, which might help you fix that problem with Windows, but it won't fix the OpenGL/graphics driver problem, which must be fixed in order for PixelCNC to use your graphics hardware for rendering. https://windowsreport.com/exe-files-not-opening-windows-10/
Good luck!