"Modifiable" warning dialog


Sometimes when I open files I see a dialog box warning me the file is marked as "modifiable" (see picture below). It usually appears when I try to open a file after my Mac or PowerCADD has unexpectedly quit. Why does that happen and should I be concerned about the integrity of the file?


Any version of Mac OS? X, any version of PowerCADD 6 (Mac OS 10.3.6 and PowerCADD 6.2 or better recommended)


Prior to version 6 of PowerCADD (and Mac OS X), the Finder provided a locked file status flag for each file that an application opened. In essence the Finder said this file is busy (open). In Mac OS X, that feature is no longer available to developers. To get around the problem, and ensure that two people don't accidentally open the same file without a warning, Engineered Software creates an invisible lock file in the same folder (directory) as the file you originally open. It's that locked file that allows you to see this warning dialog if you or someone else tries to open the same file:


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