- - A file that is open somewhere cannot be touched. It does not matter if it has been months since it was last open, what matters if Windows *thinks* it is open.
- - Some simple filenames are illegal. You will find which ones when a client is using your program.
- - Command line and command line tools are unusable or not-existent. Better use Cygwin
- - Sometimes it does not let you touch a file that you created.
- - Sometimes you, an Administrator, do not have permission to change permissions.... on a file that you created.
- - Should you win the war on permissions, it will not let you touch your file because "the file is open". (see #1 above)
Were [any] of these resolved in Windows 10?