Configure IIS to host .glsl files - GlitchEnzo/Vapor GitHub Wiki
By default, IIS (the server software used by Visual Studio) will not host .glsl files. You have to manually configure it to allow them.
1. Open a command prompt by pressing Windows Key + R and then typing "cmd" and pressing Enter
2. Navigate to the installation of IIS (ex. cd "C:\Program Files (x86)\IIS Express")
3. Enter the following command: appcmd set config /section:staticContent /+[fileExtension='.glsl',mimeType='text/plain']
4. You should see a response (ex. "Applied configuration changes..."