How to uncompress a file that has been compressed in Windows to save space (note that this is different to a zip file):

Note the indicator on the file that shows its compressed (see 1 below)

UncompressFiles01

To uncompress the file select it then right-click and properties (see 2 below)

UncompressFiles02

IN the properties dialog box chick advanced (see 3 below) then untick the "Compress contents to save space" checkbox (see 4 below), click OK then OK again to close the dialog boxes.

UncompressFiles03

Note that the indicator is now gone from the file (see 5 below)

UncompressFiles04

PS. Its a bad idea in the first place, don't use this feature