The comments about uninstalling the Macola client are correct. That functionality was removed to prevent users from unintentionally uninstalling the server portion of the client/server app. It happened enough that something had to be done. There were probably more graceful ways to prevent the uninstall from happening, but it was the decision made at the time. Since only the Pervasive version was installed from the client, it seems possible they could add the uninstall to the SQL install routine, and ship out separate cds, but problems can happen in the cd pressing facility that are far beyond Exact's control (anybody remember the Cambodian rock band?)
As for the files on the workstation, I know for a fact that when I was in support, we did have such a document. It was always a version out of revision, but served to get the job done.
Some files I remember off the top of my head:
c:\program files\common files\macola shared
c:\program files\common files\fujitsu (maybe fujitsucobol?)
c:\windows\system32\pwereg.txt
hklm\software\macola
hkcu\software\macola
Sorry that I can't remember more...also, remember that however bad Macola may seem, there are worse. I found one. Most error messages simply state 'A Message' and their support actually encouraged me to change the primary key on a table to get around a problem.