> ## Documentation Index > Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt > Use this file to discover all available pages before exploring further. # Engine Object API Compatibility with Version 10 > Engine object API compatibility changes between ABBYY FineReader Engine 12 and 10 — renamed and removed methods, properties, and signatures. This section describes all changes to the [Engine](/fine-reader/engine/api-reference/engine-object-iengine-interface) object which may require changes in the source code of your applications.

Property/Method	What has happened?	Comment
ParentWindow	Type changed	This Windows property has the \_\_int64 type. This change has been made for 64-bit operating systems support.
Licenses	Removed	Use the IEngine::GetAvailableLicenses method instead.
SetCurrentLicense	Input parameters changed	Project ID number is no longer used as an input parameter. You pass this parameter to the IEngine::GetAvailableLicenses method, and all licenses in the collection it returns have the same Customer Project ID. The method takes as an input parameter a Boolean value that specifies whether CPU cores should be used in shared mode. This is because when you reset the license for the application, in effect you re-initialize it. So you need to set shared core usage mode again, as you do when you obtain the Engine object.
OpenExistingDictionary CreateNewDictionary CreateTextLanguage	Removed	Use corresponding methods of the LanguageDatabase object. It is more convenient to have the language-related methods in language-related object, and the Engine object API becomes less massive.
CreateBaseLanguage	Removed	Use the AddNew method of the BaseLanguages object instead. It is more convenient to have this creation method in corresponding collection object, and the Engine object API becomes less massive.
CreateStandardDictionaryDesc CreateUserDictionaryDesc CreateRegExpDictionaryDesc CreateExternalDictionaryDesc	Removed	Use the AddNew method of the DictionaryDescriptions object to create a dictionary description and the GetAsStandardDictionaryDescription, GetAsUserDictionaryDescription, GetAsRegExpDictionaryDescription, or GetAsExternalDictionaryDescription methods of the DictionaryDescription object to obtain a reference to the object of the corresponding type. It makes sense to have the methods for dictionary descriptions creation in dictionary descriptions collection, and the Engine object API becomes less massive.
CreateLayoutBlocks	Removed	The method is obsolete and is no longer in use. The LayoutBlocks object cannot be an independent object, it exists only as a subobject of the Layout object. Use the properties of the Layout object to obtain collections of blocks.
PrepareMemoryImage	Renamed	The new name of the method is PrepareBitmapBits. This name is more appropriate for new memory image format — bitmap data. The pointer to a memory buffer containing image data is passed as \_\_int64. In Windows, this change has been made for 64-bit operating systems support.
PrepareAndOpenMemoryImage PrepareAndOpenBitmap PrepareAndOpenDib	Renamed	The new names of the methods are OpenBitmapBits, OpenBitmap (Windows method), and OpenDib (Windows method), respectively. Now all methods working with images conform to the same naming convention: Open... methods create an ImageDocument of the image and load it into memory; Methods with the name containing BitmapBits work with bitmap data. The pointer to a memory buffer containing image data is passed as \_\_int64. In Windows, This change has been made for 64-bit operating systems support.
OpenImage	Renamed	The new name of the method is LoadImageDoc. Now all methods working with images conform to the same naming convention: Load... methods load into memory an ImageDocument which had been created before; Methods with the name containing ImageDoc or ImageDocument work with an ImageDocument.
OpenMemoryImage OpenBitmapImage\* OpenDib\*	Removed	Use the OpenBitmapBits, OpenBitmap\, and OpenDib\ methods instead. The difference is that these methods can optionally perform image preparation during conversion to the internal format. Windows Methods
OpenImageFileFromMemory	Input parameters number changed	The pointer to a memory buffer containing image data is passed as \_\_int64. In Windows, This change has been made for 64-bit operating systems support. The variable fileFormat is no longer used as an input parameter. File format is determined using the fileName parameter. The following files can be opened from memory: PDF DjVu in Windows WDP in Windows Because of this the method now receives the pointer to IImagePasswordCallback interface, which is necessary for opening password-protected PDF files.
LoadImageDocFromMemory PrepareDib PrepareBitmap	Input parameters type changed	The pointer to a memory buffer containing image data is passed as \_\_int64. This change has been made for 64-bit operating systems support.
AnalyzePage RecognizePage AnalyzePages RecognizePages RecognizeImageAsPlainText RecognizeImageDocumentAsPlainText AnalyzeAndRecognizePage AnalyzeAndRecognizePages SynthesizePages SynthesizePagesEx	Removed	Use the methods of the FRDocument and FRPage objects instead. These were the methods that performed specific processing stages. The Engine object is intended for use in basic scenarios. Most methods it provides combine many processing stages in one.
RecognizeImageFile	Input parameters number changed	The method receives all processing and synthesis parameters as one DocumentProcessingParams object.
CreatePDFExportParamsOld CreatePDFAExportParamsOld	Removed	These methods are obsolete. To create parameters of export to PDF, PDF/A formats, use the IEngine::CreatePDFExportParams method.
CreatePdfExtendedParams CreateImageDocumentsCollection CreateLayoutsCollection	Removed	The methods are obsolete, corresponding objects are no longer in use.
CreatePDFEncryptionInfo	Removed	The method is obsolete and is no longer in use. To obtain the PDFEncryptionInfo object, you can use the EncryptionInfo property of the PDFExportFeatures object.
CreateScanManager	Input parameters number changed	The Windows method receives an optional boolean parameter specifying whether the log of scanning operation should be written. Turning off scanning logs may be useful in the situation when your application does not have access to the default folder for logs.
RestartLicening	Renamed	There was a misprint in the method name. It is now called RestartLicensing. This method is implemented in FRE for Linux and Windows.
CreateDocumentAnalyzer CreateDocumentInfo CreateExporter	Removed	The methods are not necessary anymore as the objects they created have been removed.
CreateImageDocumentsInMemory\*	Removed	The image documents are always created in memory. Users can use the SaveTo\* or SaveToFile\* methods whenever you need to save the image document on disk. Windows methods.
CreateLayout	Removed	The Layout object can no longer be used apart from the page it corresponds to.
CreateMultipageImageWriter	Behavior changed	This method now accepts extended image saving parameters for JPEG and TIFF formats.
ExportPage	Removed	Use the IFRPage::Export method instead.
ExportPages	Removed	Use the IFRDocument::Export method instead.
PrepareAndOpenImage	Removed	Use the IFRDocument::AddImageFile method to open an image file and add it to the document for processing. The ImageDocument object will be accessible via the corresponding FRPage.
PrepareImage	Removed	Use the IFRDocument::AddImageFile method to open an image file and add it to the document for processing. The ImageDocument object will be accessible via the corresponding FRPage and can be saved on disk later.