diff --git a/CHANGELOG.md b/CHANGELOG.md
index c1f405b077..a058024c9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,7 +5,7 @@ All changes to the project will be documented in this file.
 * Updated ILSpy to 7.2.1.6856 (PR: [#2447](https://github.com/OmniSharp/omnisharp-roslyn/pull/2447))
 * Include OmniSharp.Cake in .NET 6 builds (PR: [#2455](https://github.com/OmniSharp/omnisharp-roslyn/pull/2455))
 * Implement /v2/highlight for Cake (PR: [#2456](https://github.com/OmniSharp/omnisharp-roslyn/pull/2456))
-
+* Implement /open for Cake (PR: [#2457](https://github.com/OmniSharp/omnisharp-roslyn/pull/2457))
 
 ## [1.39.1] - 2022-07-25
 * Update Roslyn to 4.4.0 1.22369.1 (PR: [#2420](https://github.com/OmniSharp/omnisharp-roslyn/pull/2420))
diff --git a/src/OmniSharp.Cake/Extensions/ResponseExtensions.cs b/src/OmniSharp.Cake/Extensions/ResponseExtensions.cs
index 40ba66c03a..3244d71a43 100644
--- a/src/OmniSharp.Cake/Extensions/ResponseExtensions.cs
+++ b/src/OmniSharp.Cake/Extensions/ResponseExtensions.cs
@@ -41,7 +41,7 @@ public static async Task<QuickFixResponse> TranslateAsync(this QuickFixResponse
         {
             var quickFixes = new List<QuickFix>();
 
-            foreach (var quickFix in response.QuickFixes)
+            foreach (var quickFix in response.QuickFixes ?? Enumerable.Empty<QuickFix>())
             {
                 await quickFix.TranslateAsync(workspace, request);
 
diff --git a/src/OmniSharp.Cake/Services/RequestHandlers/Files/FileOpenHandler.cs b/src/OmniSharp.Cake/Services/RequestHandlers/Files/FileOpenHandler.cs
new file mode 100644
index 0000000000..384d49a31e
--- /dev/null
+++ b/src/OmniSharp.Cake/Services/RequestHandlers/Files/FileOpenHandler.cs
@@ -0,0 +1,14 @@
+using System.Composition;
+using OmniSharp.Mef;
+using OmniSharp.Models.FileOpen;
+
+namespace OmniSharp.Cake.Services.RequestHandlers.Files;
+
+[OmniSharpHandler(OmniSharpEndpoints.Open, Constants.LanguageNames.Cake), Shared]
+public class FileOpenHandler : CakeRequestHandler<FileOpenRequest, FileOpenResponse>
+{
+    [ImportingConstructor]
+    public FileOpenHandler(OmniSharpWorkspace workspace) : base(workspace)
+    {
+    }
+}
diff --git a/tests/OmniSharp.Cake.Tests/FileOpenFacts.cs b/tests/OmniSharp.Cake.Tests/FileOpenFacts.cs
new file mode 100644
index 0000000000..d3490fd6eb
--- /dev/null
+++ b/tests/OmniSharp.Cake.Tests/FileOpenFacts.cs
@@ -0,0 +1,49 @@
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using OmniSharp.Cake.Services.RequestHandlers.Files;
+using OmniSharp.Models;
+using OmniSharp.Models.CodeCheck;
+using OmniSharp.Models.FileOpen;
+using OmniSharp.Models.UpdateBuffer;
+using TestUtility;
+using Xunit;
+using Xunit.Abstractions;
+using Xunit.Sdk;
+
+namespace OmniSharp.Cake.Tests
+{
+    public class FileOpenFacts : CakeSingleRequestHandlerTestFixture<FileOpenHandler>
+    {
+        public FileOpenFacts(ITestOutputHelper testOutput) : base(testOutput)
+        {
+        }
+
+        protected override string EndpointName => OmniSharpEndpoints.Open;
+
+        [Fact]
+        public async Task AddsOpenFile()
+        {
+            using (var testProject = await TestAssets.Instance.GetTestProjectAsync("CakeProject", shadowCopy : false))
+            using (var host = CreateOmniSharpHost(testProject.Directory))
+            {
+                var filename = Path.Combine(testProject.Directory, "build.cake");
+                var documentId = host.Workspace.GetDocumentId(filename);
+
+                Assert.False(host.Workspace.IsDocumentOpen(documentId));
+
+                var request = new FileOpenRequest
+                {
+                    FileName = filename
+                };
+
+                var requestHandler = GetRequestHandler(host);
+
+                _ = await requestHandler.Handle(request);
+
+                Assert.True(host.Workspace.IsDocumentOpen(documentId));
+            }
+        }
+    }
+}