RE: Attached raster gets removed after closing the design file.

Thank you Jon, what you suggested has resolved my issue and it attaches a reference to my design file. 

[quote user="Jon Summers"]Possibly the MDL Function Reference might help you.  Here's an extract...[/quote]

It seems my help file is different from yours. What I see in mdlRaster_extendedInfoSet is below, and it doesn't mention anything about attachement. I also searched for ATTACH_REFERENCE keyword and it doesn't exist in my Microstation V8 MDL Help.

Function

                

long       mdlRaster_extendedInfoSet  
( 
RasterExtendedInfo const*       extendedInfo , 
long       rasterHandle , 
int       eventMode  
); 


Description

Modifies extended file information for the specified raster according to the content of the RasterExtendedInfo structure. 

Required Header

<msraster.fdf>
Required Library

rasterlib.lib

Thanks a lot again.

Kind regards,

Mohammad