If you are new to Windows 8.1 you will find that many older programs have t= o be run in "Compatibility Mode." Try this: Right click the shortcut, click "Compatibility" then check "Run as Administrator." I haven't tried MPLAB ye= t but this works on most of my "old" stuff. Allen > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of > Ariel Rocholl > Sent: Monday, May 19, 2014 6:46 AM > To: Microcontroller discussion list - Public. > Subject: [PIC] MPLAB IDE in Windows 8.1 >=20 > Hi, >=20 > We recently installed MPLAB 8.92 (latest "legacy" available for download) > in Windows 8.1 - to our surprise, the "post-build" step does not work - > although everything else work as usual apparently. "post-build" works fin= e > in several Windows 7 computers and WinXP so I wonder if this is due to > Windows 8.1 or some other unknown environmental issue. >=20 > Is "post-build" step working for anybody using Win 8.1? Any other insight= ? >=20 > Thanks in advance >=20 > Ariel Rocholl > http://www.rf-explorer.com > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .