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
clp     Conflict file
dpe     Binary format for dual-perturbed problem
dua     MPS format of explicit dual of problem
emb     MPS format of (embedded) network
flt     Solution pool filters
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
prm     Non-default parameter settings
rlp     LP format problem with generic names
rew     MPS format problem with generic names
sav     Binary matrix and basis file
sol     Solution file

File type: