When you type the write command in the Interactive Optimizer, ILOG CPLEX displays a menu of options and prompts you for a file format, like this:

File Type Options:

bas          INSERT format basis file
bin          Binary solution file
dpe          Binary format for dual-perturbed problem
dua          MPS format of explicit dual of problem
emb          MPS format of (embedded) network
iis          Irreducibly inconsistent set (LP format)
lp           LP format problem file
min          DIMACS min-cost network-flow format of (embedded) network
mps          MPS format problem file
mst          MIP start file
net          CPLEX network format of (embedded) network
ord          Integer priority order file
ppe          Binary format for primal-perturbed problem
pre          Binary format for presolved problem
qp           Quadratic coefficient matrix file
rew          MPS format problem with generic names
sav          Binary matrix and basis file
sos          Special ordered sets file
tre          Branch-and-bound treesave file
txt          Text solution file
vec          Vector solution format file

File type: