On 11/12/2012 07:24, Alexei Boulbitch wrote: > Dear community, > > During the work evaluation a cell I got the message: > > "There is a syntax error in the file being read. Do you want to open it as > a plain text?" > > Upon pressing "Yes" I got the message: > > "There was a syntax error on line 541095 in the file: 2Dgraphics.nb. > The error was: > > bdnhsNoXjUtzE3OjHyBhBxTcduHehni+" > > And the question, if I wish to open it as a plain text file. Upon the pressing the "Yes" button the hang up starts. > > The file in question cannot be open by Mathematica any more. > > It is Mathematica 9 on Windows XP. > > Alexei BOULBITCH, Dr., habil. > IEE S.A. > ZAE Weiergewan, > 11, rue Edmond Reuter, > L-5326 Contern, LUXEMBOURG > > Office phone : +352-2454-2566 > Office fax: +352-2454-3566 > mobile phone: +49 151 52 40 66 44 > > e-mail: email@example.com<mailto:firstname.lastname@example.org> > Quite apart from the failure to open the file as plain text - which is not really that useful, because it will display BoxForm structures - there are surely two important questions:
1) Do you have any idea what caused the corruption?
2) Is the notebook important to you, and if so, is it backed up?
Unless this is a bug in Mathematica 9, this sort of thing can happen if a notebook is written back to a disk just as the system is shut down (or a removable disk is pulled out).
If you need the data that has been corrupted, you can probably retrieve most of it using a text editor on the file. Try opening an uncorrupted notebook with a text editor to see what they contain.