Ok, what I am refering to is that the files will not open as I try to do so from Windows, and as I try doing so from the Reader it says "not a valid file name".
It used to hapen that if I had saved a file with a long name, subseqently I was not able to open it nor copy it from windows, so I used to rename it (using Windows of course) with a shorter name (the extension was allways intact).
I have no problen opening any other file or even other pdf's, but now that I am trying to access some particular files I find myself with this problem (that I did not have before; actually I had been able to open many of these files before).
I think and am allmost certain that it is a problem with the Reader and not Widows, because the only program I have updated is the Reader.
PS: before you ask, the files have no special characters (actually I am not allowed to save file names with these characters as you must know) and the all have the *.pdf format.