FalconView saves drawing information for Shapefiles in a .prf file, which is saved with the other Shapefile files. This page describes the format of a .prf file. Here are sample .prf file contents:

ShpPrefFile
Color,   0
ColorRGB, 255  0  0
Width,   2
Fill,   0
LineStyle,   0
Diameter,   8
Background, Y
FilterMode, N
UseIcon, N
NearLineMode, Y
LabelCode, 15
IconText, red dot2
TooltipField1, 
TooltipField2, 
StatbarField1, 
StatbarField2, 
FilterFieldName1, 
FilterFieldName2, 
FilterField1Text1, 
FilterField1Text2, 
FilterField2Text1, 
FilterField2Text2, 
FilterFieldOp, O
FilterField, 
EndOfFile

The lines in a .prf file are as follows. Each line ends with CRLF / 0x0d0a. FalconView will use a default value for omitted lines. Each period below represents a single character.

Line Format	Notes and Comments
ShpPrefFile
Color, ...	Unused
ColorRGB, .........	Example above is pure red
Width, ...	Line width
Fill, ...	Fill types defined here
LineStyle, ...	PS_SOLID, PS_DASH, PS_DOT, etc.
Diameter, ...
Background, .	Y or N
FilterMode, .	L (SHP_FILTER_LIST), R (SHP_FILTER_RANGE), or N (SHP_FILTER_NONE). May be UseFilter in some older versions of FalconView?
UseIcon, .	Y or N
NearLineMode, .	Y or N
LabelCode, <<variable length>>
IconText, <<variable length>>
TooltipField1, <<variable length>>
TooltipField2, <<variable length>>
StatbarField1, <<variable length>>
StatbarField2, <<variable length>>
FilterFieldName1, <<variable length>>
FilterFieldName2, <<variable length>>
FilterField1Text1, <<variable length>>
FilterField1Text2, <<variable length>>
FilterField2Text1, <<variable length>>
FilterField2Text2, <<variable length>>
FilterFieldOp, .	A (SHP_FILTER_OP_AND) or O (SHP_FILTER_OP_OR)
FilterField, <<variable length>>
FilterData, 0........................	0|width|fill|pen|diameter|background|selected|use_icon|R|G|B (may have multiple entries)
EndOfFile

The code that reads and writes these files in FalconView is here. This file also reads PRF files (and converts them to SLD files);