Disclaimer : I've never played with the spanish edition, but I just had a look on the Security Updates DVD for Spain / Portugal / Brazil As for the English DVD, for every security bulletin you have some numbered subfolders depending on the platform. Then you have 3 sub-sub-folders : BR, ES, PT For the ES folder, I just reviewed, as example, the MS03-23 bulletin. R:\SB2CD003\ms03-023\1\br\WindowsXP-KB823559-x86-PTB.exe 387,872 R:\SB2CD003\ms03-023\1\es\WindowsXP-KB823559-x86-ESN.exe 388,384 R:\SB2CD003\ms03-023\1\pt\WindowsXP-KB823559-x86-PTG.exe 387,872 R:\SB2CD003\ms03-023\2\br\WindowsServer2003-KB823559-x86-PTB.exe 440,608 R:\SB2CD003\ms03-023\2\es\WindowsServer2003-KB823559-x86-ESN.exe 441,632 R:\SB2CD003\ms03-023\2\pt\WindowsServer2003-KB823559-x86-PTG.exe 441,120 R:\SB2CD003\ms03-023\3\br\823559BRZ8.EXE 316,512 R:\SB2CD003\ms03-023\3\es\823559SPA8.EXE 316,000 R:\SB2CD003\ms03-023\3\pt\823559POR8.EXE 316,512 R:\SB2CD003\ms03-023\4\br\Windows-KB823559-PTB.EXE 299,104 R:\SB2CD003\ms03-023\4\es\Windows-KB823559-ESP.EXE 299,616 R:\SB2CD003\ms03-023\5\es\Windows-KB823559-ESP.EXE 299,616 R:\SB2CD003\ms03-023\8\br\Windows2000-KB823559-x86-PTB.exe 393,776 R:\SB2CD003\ms03-023\8\es\Windows2000-KB823559-x86-ESN.exe 393,776 R:\SB2CD003\ms03-023\8\pt\Windows2000-KB823559-x86-PTG.exe 394,288 It seems that for platform specific patches, the NT family has the ESN suffix, the 9x line ESP or even SPA... In addition when you look at the download page on microsoft.com for this KB, you'll see 2 entries for portuguese (Portugal and Brazil) but only one for Spanish.