Problem open pdf files from windows xp or W2K3(Not from Windows 7)

Hi,

i have some pdf files in a shared folder(W2K3).These are in other subfolders.Some of them cannot be opened .Right click options are limited (photo below).The weird thing is that happens when you try to open the files either from the server or a windows xp machine.From Windows 7 are opening normally.I thought of being an issue with file directory .Any idea ?

Thanks