There were some buggy versions of DMS which resulted in corrupt files, so I would suggest to use trannsdisk as suggested by TheCyberDruid.
http://winuaehelp.back2roots.org/started/transdisk.htm
You can use (assuming 1mb spare ram:, else replace ram: with your hard disk or df1: )
1. Insert original disk in df0:
2. transdisk >ram:dF0_1.adf -s 0 -e 75
3. Insert blank formatted floppy disk in df0: (with same file format OFS/FFS as original)
4. transdisk >ram:dF0_2.adf -s 76 -e 76
5. Insert original disk in df0:
6. transdisk >ram:dF0_3.adf -s 77 -e 79
7. cd ram:
8. COPY /B DF0_1.adf+DF0_2.adf+DF0_3.adf DF0.adf
If you want to be sure it has been extracted correctly, then repeat the procedure twice and compare adf files.
But it would be easier to use XCopy if someone uploads it to copy to a blank formatted floppy all tracks except 76 with verify turned on.
Only suggesting the extra verification as it is your one and only original disk and if track 76 is bad who knows if there are any other problems.