src/vs/workbench/contrib/debug/browser/debugMemory.ts/DebugMemoryFileSystemProvider/open
class DebugMemoryFileSystemProvider:	public open(resource: URI, _opts: IFileOpenOptions): Promise<number> {
		const { session, memoryReference, offset } = this.parseUri(resource);
		const fd = this.memoryFdCounter++;
		let region = session.getMemory(memoryReference);
		if (offset) {
			region = new MemoryRegionView(region, offset);
		}

		this.fdMemory.set(fd, { session, region });
		return Promise.resolve(fd);
	}