Where ArcGIS 10.1 stores sde files

Want to know where ArcGIS stores the *.sde files, then look below:

 

In Windows XP they were here:
C:\Documents and Settings\username\Application Data\ESRI\ArcCatalog

In Windows 7 they are here:
C:\Users\username\AppData\Roaming\ESRI\Desktop10.0\ArcCatalog

If not there, try here:
C:\Users\username\AppData\Local\ESRI\Desktop10.0\ArcCatalog