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I use Ronjon's lisp at TheSwamp for that at: http://www.theswamp.org/index.php?topic=49865.msg550417#msg550417 Slightly modified: http://www.theswamp.org/index.php?topic=49865.msg551018#msg551018

Another I use is "Everything" it is a find file program comes in handy.

Another I use is from CMD level "Findstr" cd to directory to check eg cd c:\acadtemp\lisp Findstr set *.lsp

My assumption is that you have customization that is making this change. When I run into problems like this I first search my entire lisp collection for the suspect code "set$". I use Textpad as my editor and it will search folders recursively showing list of files with matches. Another option is a program like Search Everything, https://www.voidtools.com/, which can index every file on multiple drives, and can search for content in the files, though slowly. (I use Search Everything every day as a quick launcher.) A work around would be to put code into the first loaded customization that saves SET to a temporary global variable, and resets it at the last loaded. I can't remember what gets loaded first, but for the last I would use s::startup. : (setq t1 SET) #<<FUNCTION> #x2 @fffdc4e66> : !t1 #<<FUNCTION> #x2 @fffdc4e66> : (setq SET "don't do this") "don't do this" : (SET 'a "b") ; ----- Error around expression ----- (SET 'A "b") ; error : no function definition <SET> ; expected FUNCTION at [eval] : (setq SET t1) #<<FUNCTION> #x2 @fffdc4e66> : (SET 'a "b") "b" : !a "b"