USB - Unable To Access Files

[Rhys Francis-Hopkins 1]

Apologies If I posted this topic in the incorrect location.

 

Before I demonstrate below, I recently copied these 3 files and pasted them into my USB:

 

Having restarted my laptop, I accessed my USB and the files some reason converted them to these:

 

Can anybody explain whats happened?

And any ideas on how I can convert them back to their original "yellow" files?

 

AppreciatE it.