find . -name '.txt.' -print

./InstructionManager.txt.0
./InstructionManager.txt.1

zip ./InstructionManager.txt.0.zip ./InstructionManager.txt.0
mv ./InstructionManager.txt.0.zip ./InstructionManager.txt.0
zip ./InstructionManager.txt.1.zip ./InstructionManager.txt.1
mv ./InstructionManager.txt.1.zip ./InstructionManager.txt.1

find . -name '*.txt.*' -print -exec zip '{}'.zip '{}' ; -exec mv '{}'.zip '{}' ;

file InstructionManager.txt.*

InstructionManager.txt.0: Zip archive data, at least v1.0 to extract
InstructionManager.txt.1: Zip archive data, at least v1.0 to extract

find . -name '*.txt.*' -exec zip '{}.zip' '{}' ;

find . -name '*.txt.*' -print0 | xargs -0 -r -n1 -I % sh -c '{ zip %.zip %; mv %.zip %;}'