ok i see what's going on. windows compilation failed on last update of vs2015 (Update 3 14.0.25420.10)
i used on my computer vs2015 RTM 14.0.23107.0 and binaries are built.
sorry but to compile aeond.exe and simplewallet.exe you will need to uninstall vs2015 update3 then install vs2015 rtm (iso available to download here https://xinyustudio.wordpress.com/2015/07/21/visual-studio-2015-iso-download-links-official-directoffline-links/)
take care to uncheck box "visual studio 2015 update 3" else update 3 will be downloaded automatically.
not fun but i don't have any other solution
FYI, all version numbers can be found here https://omwtm.blog/2014/12/03/visual-studio-2013-version-numbers-and-updates/
Thanks Arux. This time I've installed VSC 2015 with an installation tracker, so I'm pretty sure I can strip the SP3 off. I'll try this first, meanwhile I'm downloading the iso.
Just a nuance: does 0.9.12 require deleting of blockchain?