Windows Server 2003 support has been dropped by Microsoft, and a lot of IT depts around the world are switching over to the latest Windows Server.

With this server comes the new "dedup" feature, that can automatically deduplify files.  This happens on a schedule, eg 2am saturday.  So suddenly we are getting messages of failures of software from all over the place, due to fs::is_regular_file()

Deduped files have the REPARSE and SPARSE flag set.

On the command line, you can run

FSUTIL REPARSEPOINT QUERY

and the "Reparse Tag Value" is 0x80000013

Which is a relatively new flag known as IO_REPARSE_TAG_DEDUP

These files act as normal files, you can fopen and fread them, so I assume they should be treated almost like symlink by boost... perhaps not quite a symlink because I assume the "lstat" link properties are identical to the file's stat properties.

Typically, I iterate over directories and only process files if

fs::is_regular_file(filename) is true.

I wrote some code to check what the properties were on these files, and its not any of the possible enums detected by file_status::type().

ideas?