File search records

/* file system independent - file search parameters */

struct fsfsi {
        unsigned short  fsi_hVPB;       /* volume info. */
};

/* file system dependent - file search parameters */

struct fsfsd {
        char            fsd_work[24];   /* work area */
};

Existing file systems that conform to the Standard Application Program 
Interface (Standard API) described in this section, may not necessarily 
support all the described information kept on a file basis. When this is 
the case, file system drivers are required to return to the application a 
null (zero) value for the unsupported parameter (when the unsupported data 
are a subset of the data returned by the API) or to return a 
ERROR_NOT_SUPPORTED error (when all of the data returned by the API is 
unsupported).