| VCL Object and Component | .NET |
| EBitsError | System.Exception |
| EClassNotFound | System.Exception |
| EComponentError | System.Exception |
| EFCreateError | System.Exception |
| EFilerError | System.Exception |
| EFileStreamError | System.Exception |
| EFOpenError | System.Exception |
| EInvalidImage | System.Exception |
| EInvalidOperation | System.Exception |
| EListError | System.Exception |
| EOutOfResources | System.Exception |
| EParserError | System.Exception |
| EReadError | System.Exception |
| EResNotFound | System.Exception |
| EStreamError | System.Exception |
| EStringListError | System.Exception |
| EThread | System.Exception |
| EWriteError | System.Exception |
| IDesignerNotify | System.Object |
| IInterfaceList | System.Collections.ArrayList |
| IVarStreamable | |
| TAlignment | System.Drawing.ContentAlignment |
| TBasicAction | |
| TBasicActionLink | |
| TBits | |
| TCollection | System.Collections.ArrayList |
| TCollectionItem | |
| TComponent | System.ComponentModel.Component |
| TCustomMemoryStream | System.IO.MemoryStream |
| TDataModule | |
| TDuplicates | |
| TFiler | |
| TFileStream | System.IO.FileStream |
| THandleStream | System.IO.Stream |
| TInterfacedPersistent | System.Object |
| TInterfaceList | System.Collections.ArrayList |
| TList | System.Collections.ArrayList |
| TMemoryStream | System.IO.MemoryStream |
| TOwnedCollection | System.Collections.ArrayList |
| TPersistent | System.Object |
| TReader | System.IO.BinaryReader |
| TRecall | System.Object |
| TResourceStream | System.Resources.ResourceManager |
| TSeekOrigin | System.IO.SeekOrigin |
| TStream | System.IO.Stream |
| TStreamAdapter | System.IO.Stream |
| TStringItem | |
| TStringList | System.Collections.Generic.List |
| TStrings | System.Collections.Specialized.StringDictionary |
| TStringStream | System.IO.StringWriter |
| TThread | System.Threading.Thread |
| TThreadList | System.Collections.ArrayList |
| TVerticalAlignment | System.Windows.Forms.VisualStyles.VerticalAlignment |
| TWriter | System.IO.BinaryWriter |