From: Pol Garcia-Segura (
Date: Wed Feb 08 2023 - 13:18:56 CST

Dear Axel,

I already tried this, but I get this error message when trying to open VMD:
#osp: INITIALIZATION ERROR --> #osp:api: could not find module initializer
#osp: INITIALIZATION ERROR --> Could not find device of type: default.
Make sure you have the correct OSPRay libraries linked.
#osp: INITIALIZATION ERROR --> OSPRay not yet initialized (most likely this
means you tried to call an ospray API function before first calling
ospInit())(pid 1768)

I tried to run this (as suggested by previous VMD-L mailing list messages):

PS C:\Program Files\VMD> set VMDNOOSPRAY=1
PS C:\Program Files\VMD> .\vmd.exe

But still got the same error..

Do you know how can I solve it?

Thank you,


On Wed, Feb 8, 2023 at 7:57 PM Axel Kohlmeyer <> wrote:

> Pol,
> there *is* a 64-bit Windows build. You just have to download and install
> the latest "alpha" version.
> "Alpha" is a relative term here. Most of VMD has been stable and reliable
> for most people.
> But there have been issues with some of the GUI libraries that VMD is
> using on 64-bit for macOS and Windows, specifically
> and also those are not always 100% compatible with high-DPI screen (what
> is called "Retina" on macOS) because GUI element size settings were pixel
> based.
> If you are affected too much by Windows specific issues, you can consider
> installing the Windows Subsystem for Linux (WSL2) and then download and
> install the Linux version of VMD (but you likely still want to download the
> alpha version, since version 1.9.3 dates from 2016 and that is in computer
> terms the stone age).
> Axel.
> On Wed, Feb 8, 2023 at 1:44 PM Pol Garcia-Segura <>
> wrote:
>> Hey!
>> I was wondering if you plan to update VMD so it can be used on Windows 11
>> x64. So far, I've managed to use the x32 version for Windows 10. But it has
>> a problem in detecting the available memory of the system. Therefore, I
>> cannot run analyses because I run out of memory.
>> Is there anything I can do?
>> Thank you,
>> Pol
> --
> Dr. Axel Kohlmeyer;!!DZ3fjg!_ZCyjspUle8l6YUgAUVoLEdASVurYDG_1dYEgKoR_QLZPDG24E5phFwYjzFWX7HSVjUyvO8WkuXPxWwlVtM$
> College of Science & Technology, Temple University, Philadelphia PA, USA
> International Centre for Theoretical Physics, Trieste. Italy.