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| I know people with a switzerland residence permit can apply visa there but not sure about whether they provide service for people holding tourist Schengen visa. | |
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Residency of the country where the application is made, is not a criteria, however, the right to be in that country at the time of application is. As your friend will be in Switzerland on a valid Schengen visa, this factor is covered.
Without knowing your friend's passport nationality, I can't offer any advice, but if you complete the front page of the CIBT website, this will forward you to the page with all the relevant information. This doesn't mean that he must make his application via CIBT, but it's a fantastic source of information and used in the travel industry Worldwide.
https://cibtvisas.ch/
I worked in business travel for 10yrs, and used CIBT info and services on a daily basis.