Android studio Not opening my files correctly

[Rock Karam]

I discover a strange behavior today with android studio.
My files are not opening in the correct format. what i see is something like this

<application>
<component name="DimensionService">
<location key="WELCOME_SCREEN.0.0.1600.900" x="799" y="230" />
<location key="com.intellij.ide.util.TipDialog.0.0.1600.900" x="33" y="74" />
<location key="IdeErrosDialog.0.0.1600.900" x="0" y="182" />
<locati...

or
<application>
<component name="RecentProjectsManager">
<option name="recentPaths">
<list>
<option value="$USER_HOME$/Documents/..." />
<option value="$USER_HOME$/Documents/..." />
<option value="$USER_HOME$/Documents/..." />
<option value="$USER_HOME$/Documents/..." />
<option value="$USER_HOME$/Documents/..." />...

if i open the files in the explorer, the files are correct...

Is this a bug.. how can i fix it because i am not able solve this ??
i have made invalidate cash / restart, delete .idea & .gradle file and it has not been solved

and now it's reporting no default activity not found.
i didnt make changes to manifest ..

Can someone help me how to solve this issue

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