The instructions for installing and using this tool is very unclear.

In addition it doesn't mention what happens when you don't have any *.PcbDoc and *.SchDoc files, but only *.Pcblib and *.SCHLIB files...

The mime type for Microsoft word looks wrong:
fleep\data.json: line 70
{"type": "document", "extension": "doc", "mime": "application/vnd.ms-excel", "offset": 0, "signature": ["D0 CF 11 E0 A1 B1 1A E1", "50 4B 03 04 14 00 06 00"]},

Should be:
application/msword

Right now there is only one root group for meshes: /data/meshes/. As opposed to particles where where there can be many: /data/particles/electrons/, /data/particles/protons/, etc.

This is restricting. For example it may be desirable to store internal fields separately from external fields. So to have a structure to enable groups like: /data/meshes/dc_field/, /data/meshes/particle_field/

The PNG exporter should search for pics1.png instead of hard coding its location, so that the user can just provide their own in their levels folder. A commandline switch should be provided to request a different sprites filename, and an exception should be raised if the file cannot be found.

I've made a small rex_mesh to off converter for rex-extruder in #35 which could be refactored to a standalone executable/service.

For reference purposes, it would be convenient to have (validated) sample files in formats other than HDF5.

This also should uncover possible incompatabilities and inconsistencies between file formats (e.g. HDF5 and ADIOS lack bool due to their C roots, see openPMD/openPMD-api#50).

ADIOS is a major backend in the community and thus should deserve some attentio

For consistency with other packages names, the conda channel should release it as name openpmd-viewer as well.

Although it looks a bit unclearly documented, if you scroll down the examples show the name also with a -. This would also make it consistent with the [PyPI](https://stackoverflow.com/a/761531/2719194