After installing ADOM II 2.6, no shortcut to desktop was created in either Windows 7 or XP. Links to ADOM II 2.4 were rendered broken, but a link to ADOM II 2.3 (on Windows XP) continued linking to ADOM II 2.3.

Similarly, save games didn't transfer over. I wasn't expecting them to, but just in case that's an issue.

ADOM II 2.6 can still be run just fine by using the downloaded .jlp file.