AutoDoubler version 1.0 has been reported to sometimes unbundle FileMaker Pro files. This results in files losing their icon and giving the "Application busy or missing" message when double-clicked.
The bundle bit is stored in the header of each file, and acts as a pointer to the file's creator, where icon resources are stored, among other things. AutoDoubler compresses and decompresses files in the background, and is known to unbundle PageMaker files. A utility for re-bundling PageMaker files ships with the product, but does not work for FileMaker Pro files. AutoDoubler is a cousin of DiskDoubler.
The developer, Salient Software, has been notified of this report and will investigate the issue.
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AutoDoubler, versions prior to 1.0.5, will conflict with opening files created by ClarisWorks or FileMaker Pro.