Using Open_Buffer on .mpls files

[F4n4t]

I tried to retrieve media information using Mediainfo_Open_Buffer but all i get is the File size.

General
File size                                : 338 Bytes

If i use Mediainfo_Open i retrieve all the informations.

General
Complete name                            : 00021.mpls
Format                                   : Blu-ray Playlist
File size                                : 338 Bytes
Duration                                 : 1 h 30 min
Overall bit rate                         : 1 b/s

Video
ID                                       : 4113 (0x1011)
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Duration                                 : 1 h 30 min
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate                               : 24.000 FPS

Audio
ID                                       : 4352 (0x1100)
Format                                   : DTS XLL
Format/Info                              : Digital Theater Systems
Commercial name                          : DTS-HD Master Audio
Duration                                 : 1 h 30 min
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Language                                 : German

Menu
00:00:00.000                             : Chapter 1
00:09:52.375                             : Chapter 2
00:18:37.708                             : Chapter 3
00:30:26.500                             : Chapter 4
00:43:07.500                             : Chapter 5
00:55:22.208                             : Chapter 6
01:04:23.458                             : Chapter 7
01:14:20.041                             : Chapter 8
01:23:49.375                             : Chapter 9

I used the HowToUse_Dll3.py script to open the file.

Am i doing something wrong, or is this file not recognized as .mpls file if i open it buffered.

00021.mpls.zip

The reason why i want this to work is that i'd like to parse media information out of bluray images without mounting them first. `