Ruby

On Windows, File.stat fails on the volume mount point directory whose name contains "...".

Where %vol% is the volume ID of a new VHD volume,

C:> set vol \\?\Volume{3C458AE9-C8B1-11E5-A233-0800271D089F}\ C:> mkdir x...y C:> mountvol x...y %vol% C:> .\miniruby -e "p Dir.chdir('x...y'){File.stat('.')}" -e "p File.stat('x...y')" #<File::Stat dev=0x2, ino=1407374883553285, mode=040755, nlink=1, uid=0, gid=0, rdev=0x2, size=4096, blksize=nil, blocks=nil, atime=2016-02-01 16:35:45 +0900, mtime=2016-02-01 16:35:45 +0900, ctime=2016-02-01 16:35:45 +0900> -e:2:in `stat': No such file or directory @ rb_file_s_stat - x...y (Errno::ENOENT)	from -e:2:in `<main>' 

Note that Dir.chdir and File.stat there succeed.
This failures depends on the mount point name, because of check_valid_dir().