ulFlags (ULONG) - input

      Specifies options for the operation. Contains one or more of the following flags:

      MMIO_INSTALLPROC

        Adds a CODEC Proc to the end of the MMPMMMIO.INI file. If an existing entry in the table matches the new entry, the new entry replaces the existing entry. An entry match is determined by specifying 0 or more of the match flags. If none are specified, the default is to match on the FOURCC.
      MMIO_REMOVEPROC
        Deletes a matching entry from the MMPMMMIO.INI file. An entry match is determined by specifying 0 or more of the match flags. If none are specified, the default is to match on the FOURCC.
      MMIO_FINDPROC
        Finds a matching entry from the MMPMMMIO.INI file. This fills in the remainder of the CODECINIFILEINFO. An entry match is determined by specifying 0 or more of the match flags. If none are specified, the default is to match on the FOURCC.

        Note: If MMIO_MATCHFIRST is set, then MMIO_FINDPROC does not default to the FOURCC.

      MMIO_MATCHFIRST
        Finds the first entry in the MMPMMMIO.INI file if no match flags are specified. Otherwise, it finds the first entry that matches the contents of the fields specified by the match flags. In either case, the CODECINIFILEINFO structure is returned in the pCODECIniFileInfo parameter.
      MMIO_MATCHNEXT
        If no match flags are specified, finds the next CODEC entry in the MMPMMMIO.INI file following the entry passed in pCODECIniFileInfo. If match flags are specified, finds the next entry that matches the search criteria specified by the flags. In either case, the pCODECIniFileInfo structure is returned.
      MMIO_MATCHCOMPRESSTYPE
        Uses compression type (ulCompressType field of CODECINIFILEINFO) as a search criteria.
      MMIO_MATCHCOMPRESSSUBTYPE
        Uses compression subtype (ulCompressSubType field of CODECINIFILEINFO) as a search criteria.
      MMIO_MATCHHWID
        Uses hardware ID (szHWID field of CODECINIFILEINFO) as a search criteria.
      MMIO_MATCHCAPSFLAGS
        Uses capability flags (ulCapsFlags of CODECINIFILEINFO) as a search criteria. Note that this search is not based on the exact match. If the target entry contains the flags, the match is satisfied.
      MMIO_MATCHFOURCC
        Uses the FOURCC code (fcc field of CODECINIFILEINFO) as a search criteria.
      MMIO_MATCHDLL
        Uses the DLL Name (szDLLName field of CODECINIFILEINFO) as a search criteria.
      MMIO_MATCHPROCEDURENAME
        Uses the case-sensitive Procedure Name (szProcName field of CODECINIFILEINFO) as a search criteria.
      MMIO_FULLPATH
        Uses the drive or path given with the DLL name (szDLLName field of CODECINIFILEINFO), otherwise use only the base file name. This allows DLLs with the same base name to be loaded from different directories.

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