fix #83441

src/vs/workbench/browser/dnd.ts

@@ -20,7 +20,7 @@ import { DataTransfers } from 'vs/base/browser/dnd';
 import { DragMouseEvent } from 'vs/base/browser/mouseEvent';
 import { normalizeDriveLetter } from 'vs/base/common/labels';
 import { MIME_BINARY } from 'vs/base/common/mime';
-import { isWindows } from 'vs/base/common/platform';
+import { isWindows, isWeb } from 'vs/base/common/platform';
 import { ServicesAccessor } from 'vs/platform/instantiation/common/instantiation';
 import { isCodeEditor } from 'vs/editor/browser/editorBrowser';
 import { IEditorIdentifier, GroupIdentifier } from 'vs/workbench/common/editor';
@@ -31,6 +31,7 @@ import { IEditorGroup } from 'vs/workbench/services/editor/common/editorGroupsSe
 import { IWorkspaceEditingService } from 'vs/workbench/services/workspaces/common/workspaceEditing';
 import { withNullAsUndefined } from 'vs/base/common/types';
 import { IHostService } from 'vs/workbench/services/host/browser/host';
+import { isStandalone } from 'vs/base/browser/browser';
 
 export interface IDraggedResource {
 	resource: URI;
@@ -330,7 +331,10 @@ export function fillResourceDataTransfers(accessor: ServicesAccessor, resources:
 	event.dataTransfer.setData(DataTransfers.TEXT, sources.map(source => source.resource.scheme === Schemas.file ? normalize(normalizeDriveLetter(source.resource.fsPath)) : source.resource.toString()).join(lineDelimiter));
 
 	// Download URL: enables support to drag a tab as file to desktop (only single file supported)
-	event.dataTransfer.setData(DataTransfers.DOWNLOAD_URL, [MIME_BINARY, basename(firstSource.resource), asDomUri(firstSource.resource).toString()].join(':'));
+	// Disabled for PWA web due to: https://github.com/microsoft/vscode/issues/83441
+	if (!isWeb || !isStandalone) {
+		event.dataTransfer.setData(DataTransfers.DOWNLOAD_URL, [MIME_BINARY, basename(firstSource.resource), asDomUri(firstSource.resource).toString()].join(':'));
+	}
 
 	// Resource URLs: allows to drop multiple resources to a target in VS Code (not directories)
 	const files = sources.filter(s => !s.isDirectory);