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# Determine the Document Format

To determine a document format

1. Open the document. See Open and View a Document.

   To get format information without viewing the document, set the `VAPIDF_FLAGS_OPEN_VAPI_ONLY` flag in the `nFlags` member of the `TPVAPIOpenDocumentInfo` structure.

   To quickly determine a document's format, regardless of whether the document is supported for viewing, set the `VAPIDF_FLAGS_OPEN_FORMAT_ONLY` flag in the `nFlags` member of the `TPVAPIOpenDocumentInfo` structure. Only the `VAPIM_INIT` message with the `VAPIMWP_INIT_GETDOCFORMAT` parameter is supported when opening a document with the `VAPIDF_OPEN_FORMAT_ONLY` flag enabled.

2. Use the VAPIMWP_INIT_GETDOCFORMAT parameter of the `VAPIM_INIT` message to get the document format of the currently opened document.

3. Use the VAPIMWP_INIT_GETDOCCLASS parameter of the `VAPIM_INIT` message to get the general class to which the currently opened document belongs.

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