Can you please let us know if any of the below workarounds help:
1. On refreshing the contents of the folder (where these indesign files and idml are saved), the icons of indd and idml files should appear again
2. On the 2nd launch of InDesign the folder icons should reappear.
An error occurred while saving the commentKeely Jackson Kennemore commented
Why are my file icons looking like this? Is this happening to anyone else and is this a problem ? Kind of new at INDD...