Wyo. Stat. § 34-5-110
Any claimant having acquired any vested right in and to the said real estate conveyed as aforesaid in the two (2) preceding sections, adverse to the purchaser under the conveyances executed as aforesaid in the two (2) preceding sections, which said adverse claim was acquired five (5) years prior to January 1, 1935, shall have until the first day of January, 1936, in which to commence an action in a court of competent jurisdiction within this state, to assert and enforce such adverse right, and such vested right shall during the period herein allowed for the commencement of such action, not be affected by the provisions of the two (2) preceding sections, but from and after the time so allowed for the commencement of such action, unless such action has been brought as herein mentioned, all rights of such adverse claimant in and to such real estate shall be forever barred.
W.S. 34-5-110