I tried to load a HTML file in Sigil, coded in Windows-1252 with an em dash in it, and there were no problems. The emdash showed as such in Sigil. I checked with a hex editor that the em dash was really coded in windows-1252 (hex 97). I saved it to epub, and Sigil had converted the whole thing to utf-8. The em dash shows perfect in ADE. This is on Mac OS X, so that may be a difference. However, I would suggest to check thoroughly if your HTML file is correct (for example does it really use the Windows-1252 code for the me dash, and does it not state two conflicting encodings). But I also advice, as others have posted above, to use utf-8 for all your files. It is a much better encoding.
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