Hey Mark,
We're going to officially support Installing, uninstalling, and upgrading COM dll's in wyBuild & wyUpdate 2.7. But for now you can do it in this roundabout way:
Create 2 *.bat files. In "regasm.bat" put:
regasm %1
In "un-regasm.bat" put:
regasm %1 /unregister
Then just drag these files into the "Temporary folder" in wyBuild:
[attachment=0]wyBuild.png[/attachment]
For un-regasm.bat, make sure it executes before the update is installed. For regasm.bat make sure it executes after the update is installed.
Notice the commandline arguments are:
"%basedir%\YourFile.dll"
Just change that to whatever your dll is named, and whichever subfolder it's in (e.g. "%basedir%\Subfolder\AnotherName.dll").
wyBuild automatically replaces %basedir% with wherever the base directory is on your users' computer (e.g. C:\Program Files\YourApp\)