Error opening bkf file with msexchange backup

[joluinfante]

Hi. I'm trying to read a big bkf file (206gb), containing a msexchange backup.
The proccess start with a message:
MTF out of order (files before directory saw 1699225716 while expecting limit of 1).
I have a problem with the size of file?

[diggernet]

I'm no expert, but thought I'd have a look at the code. This error message appears to be highly misleading. As far as I can tell, the condition which produces that message is more like, "This file claims to be in directory #1699225716, but we are currently processing directory #1."
However, this does not seem to be a fatal error. Does the processing still work?

I've also found (here: https://social.msdn.microsoft.com/Forums/en-US/f9feea7e-6bc2-4ec0-9193-91575100c816/i-am-looking-an-mtf-microsoft-tape-format-specification-which-is-100b-or-newer-does-anyone ) that SQL Server uses a different version of MTF than the documentation mtftar is based on. Perhaps Exchange has also modified the format in some way, which caused this error.