Variable: TeX-arg-input-file-search
TeX-arg-input-file-search is a customizable variable defined in
latex.el.
Value
t
Documentation
If TeX-arg-input-file should search for files.
If the value is t, files in TeX's search path are searched for
and provided for completion. The file name is then inserted
without directory and extension. If the value is nil, the file
name can be specified manually and is inserted with a path
relative to the directory of the current buffer's file and with
extension. If the value is ask, you are asked for the method
to use every time TeX-arg-input-file is called.
Source Code
;; Defined in ~/.emacs.d/elpa/auctex-14.1.2/latex.el
(defcustom TeX-arg-input-file-search t
"If `TeX-arg-input-file' should search for files.
If the value is t, files in TeX's search path are searched for
and provided for completion. The file name is then inserted
without directory and extension. If the value is nil, the file
name can be specified manually and is inserted with a path
relative to the directory of the current buffer's file and with
extension. If the value is `ask', you are asked for the method
to use every time `TeX-arg-input-file' is called."
:group 'LaTeX-macro
:type '(choice (const t) (const nil) (const ask)))