diff --git a/src/lsptoolshost/activate.ts b/src/lsptoolshost/activate.ts
index 8de47bbd96..bc8d0e04d7 100644
--- a/src/lsptoolshost/activate.ts
+++ b/src/lsptoolshost/activate.ts
@@ -27,7 +27,6 @@ import { TelemetryEventNames } from '../shared/telemetryEventNames';
 import { WorkspaceStatus } from './workspace/workspaceStatus';
 import { ProjectContextStatus } from './projectContext/projectContextStatus';
 import { RoslynLanguageServer } from './server/roslynLanguageServer';
-import { registerCopilotRelatedFilesProvider } from './copilot/relatedFilesProvider';
 import { registerCopilotContextProviders } from './copilot/contextProviders';
 import { RazorLogger } from '../razor/src/razorLogger';
 import { registerRazorEndpoints } from './razor/razorEndpoints';
@@ -79,7 +78,6 @@ export async function activateRoslynLanguageServer(
 
     registerLanguageStatusItems(context, languageServer, languageServerEvents);
     registerMiscellaneousFileNotifier(context, languageServer);
-    registerCopilotRelatedFilesProvider(context, languageServer, _channel);
     registerCopilotContextProviders(context, languageServer, _channel);
 
     // Register any commands that need to be handled by the extension.
diff --git a/src/lsptoolshost/copilot/relatedFilesProvider.ts b/src/lsptoolshost/copilot/relatedFilesProvider.ts
deleted file mode 100644
index aafa79a0a1..0000000000
--- a/src/lsptoolshost/copilot/relatedFilesProvider.ts
+++ /dev/null
@@ -1,105 +0,0 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
-
-import * as vscode from 'vscode';
-import { CSharpExtensionId } from '../../constants/csharpExtensionId';
-import { CopilotRelatedDocumentsReport, CopilotRelatedDocumentsRequest } from '../server/roslynProtocol';
-import { RoslynLanguageServer } from '../server/roslynLanguageServer';
-import { UriConverter } from '../utils/uriConverter';
-import { TextDocumentIdentifier } from 'vscode-languageserver-protocol';
-
-interface CopilotTrait {
-    name: string;
-    value: string;
-    includeInPrompt?: boolean;
-    promptTextOverride?: string;
-}
-
-interface CopilotRelatedFilesProviderRegistration {
-    registerRelatedFilesProvider(
-        providerId: { extensionId: string; languageId: string },
-        callback: (
-            uri: vscode.Uri,
-            context: { flags: Record<string, unknown> },
-            cancellationToken?: vscode.CancellationToken
-        ) => Promise<{ entries: vscode.Uri[]; traits?: CopilotTrait[] }>
-    ): vscode.Disposable;
-}
-
-export function registerCopilotRelatedFilesProvider(
-    context: vscode.ExtensionContext,
-    languageServer: RoslynLanguageServer,
-    channel: vscode.LogOutputChannel
-) {
-    const copilotApi = vscode.extensions.getExtension<CopilotRelatedFilesProviderRegistration>('github.copilot');
-    if (!copilotApi) {
-        channel.debug(
-            'Failed to find comnpatible version of GitHub Copilot extension installed. Skip registeration of Copilot related files provider.'
-        );
-        return;
-    }
-
-    copilotApi.activate().then(async (api) => {
-        try {
-            const id = {
-                extensionId: CSharpExtensionId,
-                languageId: 'csharp',
-            };
-
-            context.subscriptions.push(
-                api.registerRelatedFilesProvider(id, async (uri, _, token) => {
-                    const buildResult = (
-                        activeDocumentUri: vscode.Uri,
-                        reports: CopilotRelatedDocumentsReport[],
-                        builder: vscode.Uri[]
-                    ) => {
-                        if (reports) {
-                            for (const report of reports) {
-                                if (report._vs_file_paths) {
-                                    for (const filePath of report._vs_file_paths) {
-                                        // The Roslyn related document service would return the active document as related file to itself
-                                        // if the code contains reference to the types defined in the same document. Skip it so the active file
-                                        // won't be used as additonal context.
-                                        const relatedUri = vscode.Uri.file(filePath);
-                                        if (relatedUri.fsPath !== activeDocumentUri.fsPath) {
-                                            builder.push(relatedUri);
-                                        }
-                                    }
-                                }
-                            }
-                        }
-                    };
-                    const relatedFiles: vscode.Uri[] = [];
-                    const uriString = UriConverter.serialize(uri);
-                    const textDocument = TextDocumentIdentifier.create(uriString);
-                    try {
-                        await languageServer.sendRequestWithProgress(
-                            CopilotRelatedDocumentsRequest.type,
-                            {
-                                _vs_textDocument: textDocument,
-                                position: {
-                                    line: 0,
-                                    character: 0,
-                                },
-                            },
-                            async (r) => buildResult(uri, r, relatedFiles),
-                            token
-                        );
-                    } catch (e) {
-                        if (e instanceof Error) {
-                            channel.appendLine(e.message);
-                        }
-                    }
-                    channel.trace(`Copilot related files provider returned ${relatedFiles.length} items`);
-                    return { entries: relatedFiles };
-                })
-            );
-
-            channel.debug('Registration of C# related files provider for GitHub Copilot extension succeeded.');
-        } catch (error) {
-            channel.error('Failed to register Copilot related files providers', error);
-        }
-    });
-}
diff --git a/src/lsptoolshost/server/roslynProtocol.ts b/src/lsptoolshost/server/roslynProtocol.ts
index 5db567112f..83b4e167ef 100644
--- a/src/lsptoolshost/server/roslynProtocol.ts
+++ b/src/lsptoolshost/server/roslynProtocol.ts
@@ -239,15 +239,6 @@ export interface ProjectNeedsRestoreName {
     projectFilePaths: string[];
 }
 
-export interface CopilotRelatedDocumentsParams extends WorkDoneProgressParams, PartialResultParams {
-    _vs_textDocument: TextDocumentIdentifier;
-    position: Position;
-}
-
-export interface CopilotRelatedDocumentsReport {
-    _vs_file_paths?: string[];
-}
-
 export interface SourceGeneratorGetRequestParams {
     textDocument: TextDocumentIdentifier;
     resultId?: string;
@@ -366,18 +357,6 @@ export namespace ProjectNeedsRestoreRequest {
     export const type = new RequestType<ProjectNeedsRestoreName, void, void>(method);
 }
 
-export namespace CopilotRelatedDocumentsRequest {
-    export const method = 'copilot/_related_documents';
-    export const messageDirection: MessageDirection = MessageDirection.clientToServer;
-    export const type = new ProtocolRequestType<
-        CopilotRelatedDocumentsParams,
-        CopilotRelatedDocumentsReport[],
-        CopilotRelatedDocumentsReport[],
-        void,
-        void
-    >(method);
-}
-
 export namespace SourceGeneratorGetTextRequest {
     export const method = 'sourceGeneratedDocument/_roslyn_getText';
     export const messageDirection: MessageDirection = MessageDirection.clientToServer;