Shape editing software

Sorry if this question is easy (I hope so) I did do a search on the terms and found no hits.  When within mike She under model domain and grid i choose catchment defined by shape file, and then try to edit the shape, windows popup opens stating "how do you want to open this file?...without offering any software only a link to windows store.

Which program should here open? I can then forward the info to our ICT folks.  I recall this worked years back but maybe it was 2014 software version.

thanks Hannu

Hi Hannu,
for many years we included a very simple editor for creating and modifying polygons.
We stopped supporting this tool several years ago.
Most people who use shape files have a preferred GIS platform, such as ArcGIS (expensive) or QGIS (free).
I hope this helps.
Douglas