I have been doing some work with a file geodatabase (test.gdb) which has a geometric network that I copied (using ArcCatalog or the Catalog window of ArcMap) from an ArcFM managed water network stored in SQL Server via ArcSDE at ArcGIS 10.2.x.
I have noticed that the test.gdb folder has an accompanying test.gdb.fm file, which appears to have been created at the same time as the geometric network was copied.
What is this
*.gdb.fm file used for?
When the Catalog window of ArcMap is used to rename a file geodatabase, I notice that this file does not get renamed, which suggests that ArcCatalog is unaware of it.