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bibtex8 file open error

When I launch bibtex8 under Windows 7, it terminates with a fatal error:

C:\Program Files\MiKTeX 2.9\miktex\bin>bibtex8.exe -d io -c cp1251.csf C:\Users\
D-I/O: open_ip_file: trying to open `C:/Users/skobls/Documents/ComSet/ComSet.aux
' ...
D-I/O: open_op_file: trying to open `C:\Users\skobls\Documents\ComSet\ComSet.blg
' ...
open_op_file: error opening `C:\Users\skobls\Documents\ComSet\ComSet.blg'
I couldn't open file name `C:\Users\skobls\Documents\ComSet\ComSet.blg'
(That was a fatal error)

Can this be cured somehow? Changing compatibility modes and privilege level doesn't help. The error remains even when .blg file doesn't exist.

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Why do you start bibtex in the bin folder? Switch to the document folder (ComSet) and then try bibtex8 -d io -c cp1251.csf ComSet. Absolute pathes are always a possible source of problems. – Ulrike Fischer Aug 31 '12 at 7:31
I did it so, because it is how TeXnicCenter does it. Now I've tried Ulrike's advice - it seems to work. – Skobls Aug 31 '12 at 13:11

The solution here is to use relative path.

In TeXnicCenter the correct arguments for BibTeX are following:

Path to BibTeX executable:

C:\Program Files\MiKTeX 2.9\miktex\bin\bibtex8.exe

Command line arguments to pass to BibTeX:

-B -c cp1251.csf "%tm"
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