Alrighty, question time.
So the first time I went and edited my save, it went off without a hitch (other than me having no idea how to read the code at first, that is). I was able to edit whatever I liked, and I repackaged it and sent it on its merry way. I didn't get the "this file has been tampered with" message the first time, but every subsequent time I've tried to edit the save the message has appeared. I even tried putting the files in the folder before repackaging them (the globals.lsf, levelcache, etc) and it still detected the tampering.
My questions are: Is there something I'm missing, and is there a way to subvert detection? If not, will the fact that my file has been tampered with affect my game in the future (i.e. achievements, gameplay, etc)?
Also it's worth noting that the first time I edited a save was about a week ago, and I'm using the most current version of the editor.