Sending Return Key input to “WordPerfect 6.x - 7.0 Conversion" Window from C# code

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C#

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Hi,

We are performing office automation(opening .doc,.wpd files and saving them as .html) in console application using Microsoft.Office.Interop.Word in C#.
When WPD file with graphic content is processed using the application,“WordPerfect 6.x - 7.0 Conversion" window is getting displayed and that window expects "Return" Key as input.Tried to send Return Key input automatically from application using the following methods:

Sendmessage
WinAPI.SendMessage(hWnd,WinAPI.WM_SYSCOMMAND, VK_RETURN, 0); //sending return key
WinAPI.SendMessage(hWnd,WinAPI.WM_SYSCOMMAND,SC_KEYMENU,'y') //sending Y key
WinAPI.SendMessage(hWnd,WinAPI.WM_SYSCOMMAND, VK_SPACE, 0) //sending space
//sending return key with WM_SYSKEYDOWN and WS_SYSKEYUP
SendMessage(hWnd, WM_SYSKEYDOWN, VK_RETURN , 0);
SendMessage(hWnd, WM_SYSKEYUP, VK_RETURN , 0);
WinAPI.SendMessage(hWnd,WinAPI.WM_SYSCOMMAND,WinAPI.SC_CLOSE,0);//to close the window

PostMessage
PostMessage(hWnd, WM_KEYDOWN, VK_RETURN, 0);
PostMessage(hWnd, WM_KEYUP, VK_RETURN, 0);

SendKeys
SetForegroundWindow(hWnd);
SendKeys.SendWait("Y");


Keybd_event
keybd_event(134, 0x45, KEYEVENTF_KEYDOWN | KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(13, 0x45, KEYEVENTF_KEYDOWN | KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(13, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
keybd_event(134, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0)

The above solutions are not working.However,we have similar implementation in the application to close "Show Repairs" and "Microsoft Office Word" (WinAPI.SendMessage(hWnd,WinAPI.WM_SYSCOMMAND,WinAPI.SC_CLOSE,0)) which works perfectly fine.
Can anyone help me in sending Return Key input to "WordPerfect 6.x -7.0 Conversion" window from C# code?

Thanks in advance,
Sivakumar