65 is indeed the magic number, because you're hitting the limit on per-process file descriptors for Win32 (I'm guessing 98 / ME, correct?). If you run on Win NT/2000/XP, the max goes up to 255.

I'm unsure if there's a way to increase your 98/ME fdmax, perhaps you can try setting FILES=255 in your config.sys. 

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to (MeowChow) Re: 65 is the magic number! by MeowChow
in thread 65 is the magic number! by Declarent

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