CFileDialog::GetFileExt
Call this function to retrieve the extension of the filename entered into the dialog box.
CString GetFileExt( ) const;
Return Value
The extension of the filename.
Remarks
For example, if the name of the file entered is DATA.TXT, GetFileExt returns "TXT".
If m_ofn.Flags has the OFN_ALLOWMULTISELECT flag set, this string contains a sequence of null-terminated strings, with the first string being the directory path of the file group selected, followed by the names of all files selected by the user. To retrieve file pathnames, use the GetStartPosition and GetNextPathName member functions.
Requirements
Header: afxdlgs.h