Function Entry: VL-FILENAME-EXTENSION

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Function Entry: VL-FILENAME-EXTENSION

Name

vl-filename-extension

Class

Visual LISP Pathname Function

Syntax

(vl-filename-extension filename)

Arguments and Values

filename: pathname string

Description

Returns the extension from a file name after stripping out the rest of the name.

Return Values

String extension or nil if there is no extension under host semantics.

Side Effects

None.

Availability

AutoCAD 2026: documented (per Autodesk reference page).
BricsCAD V26: presumed compatible (no contradicting page found).
Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.

Source Notes

[vl-filename-extension (AutoLISP)](https://help.autodesk.com/cloudhelp/2026/FRA/AutoCAD-AutoLISP-Reference/files/GUID-6AF5AC95-2E38-4D2C-8A81-8D26F7E80375.htm)

Notes

Autodesk documents that the returned extension begins with a period.
Autodesk documents that the function does not check whether the specified file exists.