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Message: [QUOTE="Fredrik Lundh, post: 1920625"] however, if you use the C level API, you get EINVAL (which presumably means that the CRT cannot open this file in text mode), not ENOENT. this is also true for older versions of Python: Python 2.1.1 (#20, Aug 23 2001, 11:27:17) [MSC 32 bit (Intel)] on win32Traceback (most recent call last): File "<stdin>", line 1, in ? IOError: [Errno 22] Invalid argument: 'bigfile.dat' which probably means that this fix [URL]http://www.python.org/sf/538827[/URL] is partially responsible for the misleading error message. (the cause of this seems to be that when you open a text file for updating, the CRT check if there's a chr(26) at the end of the file, but the 32-bit lseek API doesn't support seeking to positions larger than 2^31-2) </F> [/QUOTE]