As we continue our journey through shims provided by the Windows Shim Infrastructure, we have reached a point where I can no longer avoid a discussion of the shims contained in acredir.dll: RedirectFiles and RedirectRegistry. Last time around, I pointed out how to redirect the registry using VirtualRegistry, which requires a command line argument which (for a very long time) was not publicly documented. Instead, a lot of people have been using RedirectRegistry, for two important and logical reasons. First, the name just sounds so tempting, since that's exactly what you likely want to do. Second, the act.chm actually does document these shims. So, I understand why people would rationally flock to these shims. However, one of the internal questions that I address quite a bit: why can't I get xxx application to work with the RedirectFiles shim? Am I putting in the command line wrong? (and the command line follows) So, I'll just say this. You shouldn't use these shims...