Returns the file format of the specified document or file converter. Can be a unique number that specifies an external file converter, or one of the following WdSaveFormat constants: wdFormatDocument, wdFormatDOSText, wdFormatDOSTextLineBreaks, wdFormatEncodedText, wdFormatHTML, wdFormatRTF, wdFormatTemplate, wdFormatText, wdFormatTextLineBreaks, or wdFormatUnicodeText. Read-only Long.