File Attributes
File Attributes bit-flag layout

Notes: This information is found in the ioFlAttrib field of the DirInfo, HFileInfo,
FileParam, and HFileParam structures. See PBGetCatInfo,
PBGetFInfo, and PBSetCatInfo for related information.
Bit 0 indicates that the file is locked. Attempts to open the file with write
access, or to delete or rename the file will fail. Query bit 4 after calling
PBGetCatInfo to see if the returned data refers to a file or a directory.
You should NOT set any of these bits directly. Use SetFLock or RstFLock
to lock and unlock a file.