MBDyn is a free general purpose Multibody Dynamics analysis software, released under GNU's GPL 2.1

Add the following lines to ~/.config/geany/filetype_extensions.conf under the section [Extensions]

[Extensions]
MBDyn=*.mbd;*.ref;*.nod;*.elm;*.set;

Save the configuration file below in your Geany filetype definition files config directory, e.g. ~/.config/geany/filedefs/filetypes.MBDyn.conf

NB: Note that this filetype definition file is in development, meaning it can be used but needs improvement.

filetypes.MBDyn.conf

# For complete documentation of this file, please see Geany's main documentation
[styling]
# foreground;background;bold;italic
default=default
comment=0x0000FF;0xFFFFFF
commentline=0x0000FF;0xFFFFFF
commentdoc=commentdoc
number=0xFF00FF
word=0x00805C;0xFFFFFF;true;false
word2=0xA51D1D;0xFFFFFF;true;false
string=string
character=string
uuid=0x404080
preprocessor=0x8000FF;0xFFFFFF
operator=operator
identifier=identifier
stringeol=stringeol
# @"verbatim"
verbatim=0x101030
# (/regex/)
regex=0x105090
commentlinedoc=commentdoc,bold
commentdockeyword=commentdoc,bold,italic
commentdockeyworderror=commentdoc
#globalclass=type
globalclass=0x505050;0xffffff;true;false
 
[keywords]
# all items must be in one line
secondary=begin end set
primary=structural reference asbtract node body drive caller driver diag null eye string genel matrix amplitude gravity uniform single angular velocity acceleration axial rotation revolute hinge cardano brake pin clamp coincidence deformable displacement joint distance gimbal in line plane kinematic linear velocity acceleration plane prismatic rod total bezier spherical viscous abstract algebraic array state space siso mimo a b c differential air properties const file data control iterations max output meter steps forever netcdf elements  position component absolute integer ramp include force results default initial value rigid loadable aerodynamic genels drivers global dynamic variable step interpolation pad zeroes no mult orientation element user defined induced jacobian c81 real cosine driven constraint active inactive condense inertial inertia beam3 accelerations yes proportional damping origin alpha first angle units degrees problem all  module load cyclocopter delay omegacut kappa timestep polimi inflow time naive colamd nonlinear solver newton raphson modified time method tolerance none derivatives assembly skip hydraulic beams hydraulic static beam  viscoelastic generic inline super compressible incompressible thermal exponential orifice flow valve density fluid uncompressible final same elastic follower half sine dof ms offset direct parameter couple bind with offset coefficient rotor eta correction crank nicholson couple isotropic spring support bodies joints nodes bodies forces
 
 
[settings]
# default extension used when saving files
extension=mbd
lexer_filetype=C
#fold.comment.python=1
#fold.quotes.python=1
 
# single comment char, like # in this file
comment_single=#
# multiline comments
comment_open=/*
comment_close=*/
comment_use_indent=false