In the FAT file system, only date and time information contained in Level 1 file information can be modified. Zero is returned for the creation and access dates and times.

For DosQueryPathInfo to return information contained in any of the file information levels, the file object must be opened for read access, with a deny-write sharing mode specified for access by other processes. Thus, if the file object is already accessed by another process that holds conflicting sharing and access rights, a call to DosQueryPathInfo fails.