Highly implausible... unless

• Your copies of Windows are broken
• You didn't do exactly what you are showing us

Try help attrib OR attrib /? to see if you get the message you cite.

And if, perchance, glosomin.exe and data.in are on some drive other than C:, the message should have been to the effect "(filename) not found" or some variation thereof. But attrib had been an M$ command from some early, pre-Windows version of DOS.