Just to be clear, you are trying to install IE6 in a brand new bottle and from
this installer, right?
My instructions might be a little outdated as CrossOver Games' interface changed quite a bit in the newer versions.
What you would need to do:
1) With Crossover Games open, go to the menu bar, click on "Configure", then "Install software...".
2) Highlight "Other application" in "Unsupported applications".
3) Select the installer (ie6setup.exe).
4) Set the bottle type to Windows 98 (highlight "New win98 bottle...").
5) Click on "Proceed".
6) Once Internet Explorer 6 is installed in the bottle, click on the "Configure" menu and choose "Manage Bottles". Choose the bottle you created in the left-hand list. Click on the "Control Panel" tab on the right and double-click on "winecfg". Set the Windows version at the bottom of the window to Windows XP. Click OK to close the window.
7) Install whichever game you want to play in the same bottle (follow the instructions from steps 1 to 5, replace the name of the installer with the installer of the Telltale game). I used to install each game in its own bottle, but it's not really necessary.
I know that these instructions are extremely similar to the ones I posted a little over a year ago, but maybe they'll help.
Good luck!
NB: While the games are still working for me in the most current version of Crossover Games, I haven't installed any of them from scratch since CrossOver Games 8.0, so maybe something changed in the later versions that prevents the installation from working the way I described. If so, sorry!