Wolfram: File Name Extension
.wls
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WolframScript file name extension.
.wl
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Generic WolframLang file name extension. Also for WolframLang packages.
WolframLang package dev 2024-02-12 [2024-02-12 CreateAPackageFile] 〔see also Difference Between WolframLang, Mathematica, WolframEngine, WolframScript〕
.m
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Old convention of file name extension for WolframLang package files. (used from 1990s to about 2013.)
.nb
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WolframLang Notebook file name extension.