SDN file extension is for Software Distribution Network compressed file archive
Similar to SDN
@@@ - Screen files used in installation or instructionsA.D. /B.C. - Macintosh Assembly Source Code
A00 - Archive Section of a file distributed by archives
A01 - OzWin CompuServe E-mail/Forum Access SYSOP File
A01 - ARJ Multi-volume Compressed Archive
A10 - OzWin CompuServe E-mail/Forum Access SYSOP File
A11 - AIM Graphics file
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