Hi Vlad
We have a PB 10.5 Classic App for the entertainment and have been deploying it with success to users with Windows 8.
As with Windows 7 64 bit, if one is using ODBC once must be careful to use the 32 bit drivers and 32 bit ODBC found with the Windows/SysWOW64 directory and not the default odbc drivers.
Best regards
Glenn