Justice A.K.Sikri in a 2-judge bench had held that, for the purpose of claiming maintenance under Section 125, Cr.P.C., such a woman (who is not a legally wedded wife), is to be treated as the legally wedded wife.

From Para 25,

25. Thus, while interpreting a statute the court may not only take into consideration the purpose for which the statute was enacted, but also the mischief it seeks to suppress. It is this mischief rule, first propounded in Heydon’s Case[11] which became the historical source of purposive interpretation. The court would also invoke the legal maxim construction ut res magis valeat guam pereat, in such cases i.e. where alternative constructions are possible the Court must give effect to that which will be responsible for the smooth working of the system for which the statute has been enacted rather than one which will put a road block in its way. If the choice is between two interpretations, the narrower of which would fail to achieve the manifest purpose of the legislation should be avoided. We should avoid a construction which would reduce the legislation to futility and should accept the bolder construction based on the view that Parliament would legislate only for the purpose of bringing about an effective result. If this interpretation is not accepted, it would amount to giving a premium to the husband for defrauding the wife. Therefore, at least for the purpose of claiming maintenance under Section 125, Cr.P.C., such a woman is to be treated as the legally wedded wife.

Citations: [2014 SCJ 2 779], [2014 CRILJ 1076], [2014 SCC 1 188], [2013 SCALE 12 681], [2014 CRLJ SC 1076], [2013 RCR CRIMINAL SC 4 764], [2013 CTC 6 86], [2014 AIR SC 256], [2014 NCC 1 238], [2013 RLW SC 4 3670], [2013 AIOL 3407], [2013 AD SC 11 9], [2013 RCR CIVIL SC 4 830], [2013 SCC ONLINE SC 946], [2014 JLJR SC 1 78], [2014 LW CRL 1 646], [2014 SCC CIV 1 51], [2013 JCC SC 4 2765], [2014 LW 2 936], [2013 ACR 3 3010], [2014 MPHT 2 499], [2014 GLH 1 273], [2013 KERLT 4 367], [2013 ALR 101 704], [2013 BOMCR CRI SC 4 616], [2013 SLT 9 543], [2013 DMC 3 518], [2014 ECRN 1 241], [2014 AIR SC 869], [2013 JT 13 570], [2013 AIC 132 108]

Other Source links: https://indiankanoon.org/doc/15901386/ or https://www.casemine.com/judgement/in/5609af37e4b0149711415daf

Earlier Chanmuniya judgment is here.