This structure is only used in the message dbx files.
OE creats a message text structure when a message is read the first time. This structure is saved as the content of the index 0x1c of the corresponding message info object.
I have not decoded the message text structure but I have identified many values. I will show my results with 2 examplaric message text structure.
1.) The message text structure of a message with text. Length = 8f (3 padding fields at the end. 0x00000000 : 88000000 0100B24A 33080000 .......J....3... > 0x0088 Length of the structure behind the value. > 0x4AB2 Seems to be a marker to identify the following blocks > 0x0833 Length of the 'message text' 0x00000010 : B24A0000 01000000 .J.............. 0x00000040 : 39050000 ............9... 0x00000050 : 33080000 01000000 3............... > 1. block > Identifies the message body > 0x0539 Start of the 'message text' body behind the header > 0x0833 Length of the 'message text' 2.) The message text structure of a message with text and one attachment. Length = 0x144 0x00000000 : 40010000 0100AEFC 42060000 @...........B... > 0x0140 Length of the structure behind the value > 0xFCAE Seems to be a marker to identify the following blocks > 0x0642 Length of the 'message text' 0x00000010 : AEFC0000 03000000 ................ 0x00000030 : 02000000 ................ > 1. block > 0x03 Number of the following blocks ? > 0x02 Number of the blocks which identify text blocks ? 0x00000040 : AEFC0200 AEFC0100 BF010000 ................ 0x00000050 : 42060000 01000000 B............... > 2. block > Identifies the message body > 0x01BF Start of the 'message text' body behind the header > 0x0662 Length of the 'message text' 0x00000090 : AEFC0000 AEFC0200 ................ 0x000000A0 : 67030000 11060000 ........g....... 0x000000B0 : C1020000 04000000 94020000 ................ > 3.block > Identifies the attachment > 0x0294 start of the block marker and 0x02C1 the end > 0x0367 start of the decoded attachment and 0x0611 the end 0x000000F0 : AEFC0000 AEFC0100 ................ 0x00000100 : 71020000 92020000 1C020000 ....q........... 0x00000110 : 04000000 EF010000 ................ > 4.block > Identifies the text > 0x01EF start of the block marker and 0x021C the end > 0x0271 start of the text and 0x0292 the end