whenever I encounter a file extension I don't know, I Google it along with the phrase,"file extension." I've pasted one of the result links below. Though several possibilities are listed, the most likely one seems to be Clarion for Dos files, which may appear on a Windows computer as the result of a broken association in the registry. http://www.file-extensions.org/cla-file-extension-clarion-for-dos-source-code-file Not sure if this helps. VICUG-L is the Visually Impaired Computer User Group List. Archived on the World Wide Web at http://listserv.icors.org/archives/vicug-l.html Signoff: [log in to unmask] Subscribe: [log in to unmask]