Don't work with a document on a floppy disk, under any circumstances! This
is not related to your immediate problem, but opening a document on a floppy
will corrupt the document and likely the floppy also.
Or do you mean you are selecting the file name in Windows Explorer? -- if
so, make sure you don't have a rectangle around the file name when you make
the copy: if you select a filename then click a second time (ie slower than
a double-click) you are editing the filename itself. So if you then copy,
it's the file *name* you copy, not the file.