Source
GroupWise* engine; file input/output.

Explanation
Too many files open.

Possible Cause(s)
Unable to open additional files. All available file handles have been used. The operating system has no more file handles to give to the caller.

Action(s)
If using Windows** 3.1, increase the number of file handles in your CONFIG.SYS file, close some of your open files, or do both.

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