Just installed 64-Bit-Version, rebuilt some 32-bit-Console-Apps.
Some results:
1) Warnings
The (new?) warnings (level 2) are very helpful in my opinion.
e.g.
O:\Sources\FileSrch\FILESRCH.C(809): warning #2250: Declaration of 'dir' is shadowing previous declaration at O:\Sources\FileSrch\FILESRCH.C(778).
2) Antivirus-Software
F-Secure Client Security 11 does _not_ complain about suspicious code (as mentioned before for single threaded applications sometime in 2013 I think)
3) External Files (IDE)
I was not able to delete an external C-Source-File, for which no dependency is in the project. Some menu-items (including Delelte) are not available (cmp. external.JPG).
4) ctype.h
The Macro _WHITE clashes with a declaration for a color in graph.h (Old header-file from older DOS MS-C and OpenWatcom C). I created a very simple graph.lib for own purposes but used the original header). Perhaps it is possible to use 2 leading underscores for these macros in this headerfile __WHITE ? (but not very important).