After pulling my hair and almost post o bug over here because i couldnt open a dwg customer's file, while this one could be open in other software i.e. Rhino o vectorworks, i noticed that the contained folder has an "" letter on it, i change it and that solved the problem, i put the letter on the name of other file that use to open OK and guess, doesn't open, so Spanish people avoid to use this letter on your files or folder's name.

Regards

Luis G

Well, you dont use it on the UK, but is often used on many other countries, and if someone don't notice that that could be a problem i will be really frustrated