My mistake, you're right. Version number can lead to this confusion. Thank you, I'll try ASAP. Edit: if you extract the XP Remote Desktop update from http://www.microsoft.com/downloads/en/details.aspx?FamilyId=72158b4e-b527-45e4-af24-d02938a95683&displaylang=en , it includes more files to be updated (dependencies maybe, on my tests they were necessary to be updated too) aaclient.dll aaclient.dll.mui msrdpwebaccess.dll mstsc.exe mstsc.exe.mui mstscax.dll mstscax.dll.mui tsgqec.dll tsgqec.dll.mui tswbprxy.exe wksprt.exe wksprt.exe.mui wksprtps.dll