its helper with skyboxes and nice code which will help you

Skybox\NewSkybox\NewSkybox\bin\x86\Debug\Content\Skyboxes\cube.xnb
......\.........\.........\...\...\.....\.......\........\Skybox.xnb
......\.........\.........\...\...\.....\.......\........\Sunset.xnb
......\.........\.........\...\...\.....\NewSkybox.exe
......\.........\.........\...\...\.....\NewSkybox.pdb
......\.........\.........\Content\Content.contentproj
......\.........\.........\.......\obj\x86\Debug\Content.contentproj.FileListAbsolute.txt
......\.........\.........\.......\...\...\.....\ContentPipeline.xml
......\.........\.........\.......\...\...\.....\ResolveAssemblyReference.cache
......\.........\.........\.......\...\...\.....\Skyboxes\SkyBoxModel_0.xml
......\.........\.........\.......\Skyboxes\Skybox.fx
......\.........\.........\.......\........\SkyBoxModel.fbx
......\.........\.........\.......\........\Sunset.dds
......\.........\.........\Game.ico
......\.........\.........\Game1.cs
......\.........\.........\GameThumbnail.png
......\.........\.........\NewSkybox.csproj
......\.........\.........\NewSkybox.csproj.Debug.cachefile
......\.........\.........\NewSkybox.csproj.user
......\.........\.........\obj\x86\Debug\cachefile-2cb96ec0-c00e-498d-acb6-7b1f2849a0f1-targetpath.txt
......\.........\.........\...\...\.....\Microsoft.Xna.Framework.RuntimeProfile.txt
......\.........\.........\...\...\.....\NewSkybox.csproj.FileListAbsolute.txt
......\.........\.........\...\...\.....\NewSkybox.exe
......\.........\.........\...\...\.....\NewSkybox.pdb
......\.........\.........\Program.cs
......\.........\.........\...perties\AssemblyInfo.cs
......\.........\.........\SkyBox.cs
......\.........\NewSkybox.sln
......\.........\NewSkybox.suo
......\.........\.........\bin\x86\Debug\Content\Skyboxes
......\.........\.........\Content\obj\x86\Debug\Skyboxes
......\.........\.........\.......\...\...\.....\TempPE
......\.........\.........\bin\x86\Debug\Content
......\.........\.........\Content\bin\x86\Debug
......\.........\.........\.......\obj\x86\Debug
......\.........\.........\obj\x86\Debug\TempPE
......\.........\.........\bin\x86\Debug
......\.........\.........\Content\bin\x86
......\.........\.........\.......\obj\x86
......\.........\.........\obj\x86\Debug
......\.........\.........\bin\x86
......\.........\.........\Content\bin
......\.........\.........\.......\obj
......\.........\.........\.......\Skyboxes
......\.........\.........\obj\x86
......\.........\.........\bin
......\.........\.........\Content
......\.........\.........\obj
......\.........\.........\Properties
......\.........\NewSkybox
......\NewSkybox
Skybox

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