This is an auxiliary library that user mode applications use to perform
administrative tasks on file systems. Client applications are
chkdsk.exe and format.exe. Development is suspended
because it is undocumented, but it is known that it works like the ODBC
manager with ODBC drivers. The per file system class driver, is a
library named Utype.DLL, where type may be
FAT (UFAT.DLL), NTFS
(UNTFS.DLL), MINIX (UMINIX.DLL).
FMIFS.DLL code is in reactos/lib/fmifs.
| Status | Flags | Ordinal | Symbol | Note |
| S | U | 1 | Chkdsk | chkdsk.c |
| S | U | 2 | DiskCopy | diskcopy.c |
| S | U | 3 | EnableVolumeCompression | compress.c |
| S | U | 4 | Extend | extend.c |
| S | U | 5 | Format | format.c |
| S | U | 6 | FormatEx | format.c |
| S | U | 7 | InitializeFmIfs | init.c |
| S | U | 8 | QuerySupportedMedia | media.c |
| S | U | 9 | SetLabel | label.c |