KeePass v2.xx requires .NET which is handled by mono.
Using an "Other Application" installation into a new winxp bottle, install the following:
KeePass-2.13-Setup.exe
mono-2.8.1-gtksharp-2.12.10-win32-3.exe
Then in the CrossOver "Run Command" dialog box, in the Command field:
"/Users/<username>/Library/Application Support/CrossOver/Bottles/KeePass/drive_c/Program Files/Mono-2.8.1/bin/mono.exe" "/Users/<username>/Library/Application Support/CrossOver/Bottles/KeePass/drive_c/Program Files/KeePass Password Safe 2/KeePass.exe"
where <username> is your username. Make sure to keep both applications in quotes to handle the spaces in the paths. Basically mono is acting like a wrapper, so normally a user would type:
mono KeePass.exe
Finally:
Click the [Save Command to Programs Menu]
and give your command a name.