[QGIS-Developer] Where are value maps / defaults stored on shape file layers?

[Patrick Dunford]

Good evening (here)

I had Qgis 2.99 crash and it left the shape file data with three of the 
data files that make up the shapefile, with _packed in their name.

Although renaming the files got the data back, the value maps and 
default values for new features for this layer have disappeared.

Is there a particular file that stores this data for the layer (before I 
decide whether this could be a bug or not)?

Thanks