# New User - Cross\_Section.XML issue

**URL:** <https://openmc.discourse.group/t/new-user-cross-section-xml-issue/629>\
**Category:** User Support\
**Created:** [June 25, 2020, 3:18pm UTC](https://openmc.discourse.group/t/new-user-cross-section-xml-issue/629 "2020-06-25T15:18:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Andrew\_Parker](https://avatars.discourse-cdn.com/v4/letter/a/b19c9b/32.png) [@Andrew\_Parker](https://openmc.discourse.group/u/Andrew_Parker)\
**Post date:** [June 25, 2020, 3:18pm UTC](https://openmc.discourse.group/t/new-user-cross-section-xml-issue/629/1 "2020-06-25T15:18:25Z")

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HI,

I am a new user to OpenMC. I have (I think) got it up and running int he WSL environment, downloading the OpenMC code from source and compiling with MPI. I also have the python api sorted. Despite this I can’t seem to find the appropriate cross\_section.xml file for the environment variable to point to. It doesn’t seem to be in the source code folders that were downloaded. I have found the the data files that contain all the .h5 cross sections but I don’t see the cross\_section.xml file.

Any help with this will be mcuh appreciated.

Thanks  
Andrew

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**Author:** ![Pranto](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/pranto/32/489_2.png) [@Pranto](https://openmc.discourse.group/u/Pranto)\
**Post date:** [June 25, 2020, 3:24pm UTC](https://openmc.discourse.group/t/new-user-cross-section-xml-issue/629/2 "2020-06-25T15:24:24Z")

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Hi Andrew,

[Download data library from following link. Data library](https://openmc.org/official-data-libraries/).