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A 16-bit Windows-based application, which uses many DDE connections, failsafter a while when running on Windows NT. The application works correctlyon Windows 3.1.
After more than 26 concurrent DDE connections have been created, an error0x400f (a system API failed inside of the DDEML) is returned when closingthe twenty-seventh connection. This problem is due to a timer, which isassociated with a window, not being freed when the relevant window isdestroyed.
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
152734 how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: