*.sd7
and SAS for Windows Version 9.x doesn't recognize them.
SOLUTION:
*.sd7
as the extension for SAS Data Sets to provide compatibility
with older versions of DOS that allowed only 3-character
extensions.
To use these SAS Data Sets in Version 9.x and up of SAS,
simply change the extension from *.sd7 to
*.sas7bdat.
This is done outside of SAS, using Windows Explorer, the
"My Computer" shortcut, or a Command Prompt
window.
If you need help changing (and verifying) a file extension, please contact ITS Customer Support:
LVL Lower Commons -- <consult@usc.edu> -- 213.740.2840