When I try to open previously saved .model file in Asset Forge nothing happens, no error messages, but no model loaded either.
I post my .model file contents here in case it is useful for finding solution
# Made using Asset Forge (2.1.1)
:materials
[name:dark;color:RGBA(0.224, 0.235, 0.275, 1.000);scale:(1.0, 1.0);shader:Default;valueA:0.35;valueB:0;]
[name:_defaultMat;color:RGBA(0.939, 0.953, 1.000, 1.000);scale:(1.0, 1.0);shader:Default;valueA:0.35;valueB:0.25;]
[name:metalPurple;color:RGBA(0.933, 0.404, 0.404, 1.000);scale:(1.0, 1.0);shader:Default;valueA:0.35;valueB:0;]
[name:custom3;color:RGBA(0.000, 0.000, 0.000, 0.000);scale:(1.0, 1.0);shader:Default;valueA:0.5;valueB:0.15;]
:models
[name:;collection:Aircraft;type:engine_round;position:(0.0200, 0.3600, -1.8000);rotation:(0.0000, 0.0000, 0.0000);scale:(0.6400, 0.6400, 0.6000);group:;locked:False;hidden:False;materials:dark+metalPurple+metalPurple;]
[name:;collection:Aircraft;type:turbine_flaps;position:(-0.6100, 0.5000, 1.8000);rotation:(0.0000, 0.0000, 270.0000);scale:(1.0000, 1.2100, 1.0000);group:;locked:False;hidden:False;materials:dark+metalPurple+metalPurple;]
[name:;collection:Aircraft;type:hull_slant;position:(0.0000, -0.2257, -0.5000);rotation:(0.0000, 0.0000, 0.0000);scale:(1.0000, 1.2197, 2.0000);group:Group_2;locked:False;hidden:False;materials:metalPurple+metalPurple;]
[name:;collection:Aircraft;type:hull_front;position:(0.0000, -0.2200, 1.0000);rotation:(0.0000, 0.0000, 0.0000);scale:(1.0000, 1.2100, 1.0000);group:Group_1;locked:False;hidden:False;materials:metalPurple+metalPurple;]
[name:;collection:Aircraft;type:hull_tailEdge;position:(0.0000, 0.3600, 0.7000);rotation:(45.0000, 0.0000, 0.0000);scale:(1.0000, 1.0000, 1.0000);group:Group_9;locked:False;hidden:False;materials:metalPurple+metalPurple;]
[name:;collection:Aircraft;type:hull_tailEdge;position:(0.3800, 0.6500, 0.8100);rotation:(0.0000, 270.0000, 0.0000);scale:(0.5526, 0.6500, 0.5905);group:Group_9;locked:False;hidden:False;materials:metalPurple+metalPurple;]
[name:;collection:Aircraft;type:hull_tailEdge;position:(-0.3778, 0.6550, 0.8137);rotation:(0.0000, 90.0000, 0.0000);scale:(0.5526, 0.6500, 0.5906);group:Group_9;locked:False;hidden:False;materials:metalPurple+metalPurple;]