If a user wants to search for a string of text in various files in various directories, and replace instances of that search string with new text, he can easily do so by Edit > Replace (Ctrl + H by default), regardless of whether or not any files are currently open – as it should be. But if the user wants to only search and not do any replacements, then the usual Edit > Find (Ctrl + F) does not work if there are no files currently open. There is no apparent reason for this prerequisite for searching.
One could argue that the user could always do Edit > Replace and simply not make any replacements, but that is not intuitive and also risks accidental replacement, because after the user presses Enter and the search finishes, Komodo IDE seems to make all of the replacements in memory, and then pops up a dialog box asking if the user wants to cancel the changes or continue to make them. If the user misunderstands the dialog and clicks the “Continue” button, then all of the instances of the search string would be replaced by whatever text, if any, that just happens to be in the “Replace” field when the process is started.
This feature request is to change Edit > Find so that it can be used to search through files on disk even if the user does not have any files currently open.