"Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@bfxyz.nl to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log."

While i try to download anything ... can you fix it ?
Thank you.

ps
for example
https://www.bfxyz.nl/cgi-bin/bfxdownloader.pl?file=bfx64.xll

I have updated bfx.xll and bfx64.xll as well as the setup files. Functions did not change. BfX is still going strong!

I have recompiled bfx.xll, bfx64.xll with Visual Studio C++ 2022

An excel implementation of the following article.
https://www.sciencedirect.com/science/article/pii/S2214914717301459

See attached excel file.

Happy shooting ...

one can specify that one wants to use the density of a certain material in BfX_Bcs, eg =bfx_bcs(1;"Cu/m^3";0,5;"in") calculates the ballistic coefficient of an 0.5 inch copper round ball

Today I have uploaded a freshly compiled version of BfX.
Furthermore I have added a BfX_Bcs(density of bullet;diameter of bullet) to compute the ballistic coefficient of spherical (round) bullets. These can be used in combination with the GS drag function.
The new version of Getting Started.xls(x) illustrates computations with BfX_Bcs.

E.g the velocity of a .50 inch lead round ball, with muzzle velocity 2012 fps at 100yd: =BfX_Vx("fps";2012;"fps";100;"yd";BfX_Bcs(0,41;"lb/in^3";0,5;"in");"GS") (which would result in 1046 fps)

I have added bfx_Bcs
That computes the ballistic coefficient of spherical bullets.
I have to updated  the "Getting started" to and check some other things in the code
Lydia

by the way,
bfx looses accuracy for elevations above 15 degrees. In practice this affects max range / long distance calculations.

e.g.  .50 round lead ball bc= 0.107 lb/in^2

I have (re)done the research.

The ballistic coefficient is computed from m/(d*d) where m is the mass of the pellet in lb and d its diameter in inch

or bc = density*pi*d/6

density lead = 0.41 lb/in^3
density steel = between 0.280 and 0.291 lb/in^3
The drag function to use is "GS" in bfx which matches the one in the above link