I have an app with a custom file type. I registered the file ext in the Registry with the usual Shell\Open key which worked fine for launching my app when a user attempted to open a file in Explorer. However, I wanted to be able to get Explorer to use any running instance of the app so I started to mess around with DDE.
Now when a user opens a file, Explorer correctly uses any running instance, but if there are *no* apps running, the previously working Shell/Open appears to be broken - an error pops up:
"Cannot find the file '<my file>' (or one of its components). Make sure the path and filename are correct and that all required libraries are available."
, even though the file definitely exists!
Is there some DDE setting that I'm missing here? Delphi itself seems to startup ok if you click a .pas file etc.
