In a win3.1 program I try to display the contents of a text file in a multiline edit control. I allocate memory using GlobalAlloc and GlobalLock without any problems. After this I read the text file in the buffer and try to display the text in the edit control using WM_SETTEXT. This works fine if the size of the text buffer is not larger than 30k. If it is larger WM_SETTEXT returns 0 and nothing is displayed in the edit control.