version number

If i read an autocad file in notepad the first 6 bytes give me the version number, however on this particular file it reads AC1015 what does this
indicate?
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See: http://vbdesign.hypermart.net/acad/ACADJAN1901.txt
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<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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