--- /dev/null
+
+/**
+ @file
+ \brief Help for the open file
+*/
+
+/**
+ \page open Open file
+
+ <a href="index.html"><b>Back to Main page.</b></a>
+
+ The HYDROGUI module supports opening documents. This operation can be called via:<ol>
+ <li> The main menu <b>File => Open</b>;</li>
+ <li> <b>CTRL + O</b> buttons combination;</li>
+ <li> <b>Open document</b> toolar button. </li>
+ \image html open_document_toolbar_button.png "Open document toolbar button"
+ </ol>
+
+ In case if there is an active study in the session, <b>Close active study</b> warning appears:
+ \image html close_active_study_warning.png "Close active study warning"
+
+ <b>Save & Close</b> - button to save active study and open new file;<br>
+ <b>Close w/o saving</b> - button to ingore saving active study and open new file;<br>
+ <b>Cancel</b> - button to reject opening new file.br>
+
+ <b>Open file</b> dialog box looks like:
+ \image html open_file_dialog_box.png "Save file dialog box"
+
+ <b>Supported format: .HDF</b><br>
+
+ Additionally, <b>Reopen file</b> operation is supported. It can be called from the main menu <b>File => Reopen</b>. After that dialog box appears, clarifying the user's desire to reopen document:
+ \image html reopen_file_dialog_box.png "Reopen file dialog box"
+
+ <b>Yes</b> - button to reopen file and lost all not saved data;<br>
+ <b>No</b> - button to reject reopening.<br>
+
+ <a href="index.html"><b>Back to Main page.</b></a>
+*/
