i don't think some people can fully comprehend what you discovered, but it's very interesting. one thing i have to note about your observations: (regsrv32 /i) != (regsvr32 /s) found a reginst in shdocvw.dll, shgina.dll, not finding them anywhere else so far...i think i've opened like 50 some strange bitmaps in windows DLLs, did you see the banners for codename Whistler in msgina? and stringtable 126 in xpsp3res.dll says: STRINGTABLE LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US { 2000, "Microsoft Windows" 2001, "Version 2006" 2002, "Version 1.0" } 122.bmp