Try this...
1 19 10 10 0 1 0 0 0 1 0 0 0 1 64782.dat
1 19 10 10 -60 0 0 -1 1 0 0 0 -1 0 32278.dat
1 0 -70 -10 -80 1 0 0 0 1 0 0 0 1 63869.dat
1 0 90 -10 -80 1 0 0 0 1 0 0 0 1 63869.dat
1 71 10 -10 -80 1 0 0 0 1 0 0 0 1 60485.dat
0 STEP
0 BUFEXCHG A STORE
1 71 10 -10 -140 1 0 0 0 1 0 0 0 1 stairs.ldr
0 !LPUB PART BEGIN IGN
0 MLCAD ARROW 71 65 -35 -85 0.707107 0.707107 0 -0.707107 0.707107 0 0 0 1 10 4 12 40 3 30 1 2 16 16
0 !LPUB PART END
0 STEP
0 BUFEXCHG A RETRIEVE
0 !LPUB PART BEGIN IGN
1 71 -60 -36 -26 0 0 -1 0.978148 0.207912 0 0.207912 -0.978148 0 stairs_folded.ldr
0 !LPUB PART END
1 4 120 -10 -140 1 0 0 0 1 0 0 0 1 3704.dat
0 STEP
0 !LPUB INSERT PAGE
0 !LPUB INSERT BOM
1 19 10 10 0 1 0 0 0 1 0 0 0 1 64782.dat
1 19 10 10 -60 0 0 -1 1 0 0 0 -1 0 32278.dat
1 0 -70 -10 -80 1 0 0 0 1 0 0 0 1 63869.dat
1 0 90 -10 -80 1 0 0 0 1 0 0 0 1 63869.dat
1 71 10 -10 -80 1 0 0 0 1 0 0 0 1 60485.dat
0 STEP
0 BUFEXCHG A STORE
1 71 10 -10 -140 1 0 0 0 1 0 0 0 1 stairs.ldr
0 !LPUB PART BEGIN IGN
0 MLCAD ARROW 71 65 -35 -85 0.707107 0.707107 0 -0.707107 0.707107 0 0 0 1 10 4 12 40 3 30 1 2 16 16
0 !LPUB PART END
0 STEP
0 BUFEXCHG A RETRIEVE
0 !LPUB PART BEGIN IGN
1 71 -60 -36 -26 0 0 -1 0.978148 0.207912 0 0.207912 -0.978148 0 stairs_folded.ldr
0 !LPUB PART END
1 4 120 -10 -140 1 0 0 0 1 0 0 0 1 3704.dat
0 STEP
0 !LPUB INSERT PAGE
0 !LPUB INSERT BOM
If nothing goes right, go left.