Catalysis of the reaction: a 6-O-(beta-D-xylopyranosyl)-beta-D-glucopyranoside + H2O = 6-O-(beta-D-xylopyranosyl)-beta-D-glucopyranose + an alcohol.
6-O-(beta-D-xylopyranosyl)-beta-D-glucopyranoside 6-O-(beta-D-xylosyl)-beta-D-glucohydrolase activity