As long as the entry visa is valid, you may travel with it to France as it is valid for all Schengen countries (unless it states differently). Upon expiry of the visa, you should get a re-entry visa (visa de retour) if you would need a visa to enter Switzerland.

Thank you - no the problem is that the entry visa is not Schengen. It is national Swiss (D) type.

The issue is not with the permission to stay in Switzerland, that one is fine and well-sorted. It is with the visit to France while Switzerland is getting the carte de legitimation ready.

A D visa is valid for all Schengen unless is specifies differently, e.g. "except France". You may travel within the Schengen area without restrictions during is validity.

If it is a single entry visa, this also refers to the Schengen area, i.e. you may travel within the Schengen area but should not leave it without a re-entry visa.

Thank you! Did not know this. Will have a look. It does not seem logical though - why have separate national and Schengen visa if both have same coverage. Will see.

Seems true! Thank you! Will double-check with the French Consulate to be 100 % sure.

The Council adopted a regulation of the European Parliament and of the Council amending
the convention implementing the Schengen agreement and regulation (EC No 562/2006) as
regards movement of persons with long-stay visas (7392/10). Long-stay visas, or so-called
"D" visas, are visas issued to third country nationals for periods of stay longer than three
months.
The new provisions concern mainly three aspects: free movement, maximum validity of
long-stay visas, and security aspects.
Concerning free movement, third country nationals with a long-stay visa are put on the
same footing as third country nationals holding valid residence permits: They will be able
to move freely for up to three months in any six-month period within the territories of the
other Schengen states. This is important for two reasons: First, for the general purpose of
free travel within the Schengen area and second, for the specific purpose of transit through
another Schengen state when returning from the country that issues the visa.

Because all shenghen visas have a country written on them. for example if you get one through the French embassy it will be written France, If through Switerland it will be written Switzerland. But it is still valid in all the shenghen countries.

This is not correct. A national visa is required to take up residency in a country, a Schengen visa is per se temporary and the holder must leave the Schengen area when it expires.

P.S. the "not correct" only refers to the "because". Of course, each visa eflcts the issuing country.

Family reunification visa issued is valid in all schengen country until its expiry date, Type D means your CdL is under process.

While extension of visa used to be the practise for CdL holders the Swiss mission discourages this.  DO NOT visit the OCP for an extention, CdL are requwested by the Swiss mission to OCP. Any query you need should be asked through your spouse's CdL unit.