diff --git a/ixmp/backend/jdbc/gamsxjni64.dll b/ixmp/backend/jdbc/gamsxjni64.dll deleted file mode 100644 index af8b375aa..000000000 Binary files a/ixmp/backend/jdbc/gamsxjni64.dll and /dev/null differ diff --git a/ixmp/backend/jdbc/gdxjni64.dll b/ixmp/backend/jdbc/gdxjni64.dll deleted file mode 100644 index 9b786b284..000000000 Binary files a/ixmp/backend/jdbc/gdxjni64.dll and /dev/null differ diff --git a/ixmp/backend/jdbc/gevmjni64.dll b/ixmp/backend/jdbc/gevmjni64.dll deleted file mode 100644 index c96aad5d6..000000000 Binary files a/ixmp/backend/jdbc/gevmjni64.dll and /dev/null differ diff --git a/ixmp/backend/jdbc/gmdjni64.dll b/ixmp/backend/jdbc/gmdjni64.dll deleted file mode 100644 index 3bf28f053..000000000 Binary files a/ixmp/backend/jdbc/gmdjni64.dll and /dev/null differ diff --git a/ixmp/backend/jdbc/gmomjni64.dll b/ixmp/backend/jdbc/gmomjni64.dll deleted file mode 100644 index 1699eea34..000000000 Binary files a/ixmp/backend/jdbc/gmomjni64.dll and /dev/null differ diff --git a/ixmp/backend/jdbc/idxjni64.dll b/ixmp/backend/jdbc/idxjni64.dll deleted file mode 100644 index 9d200db03..000000000 Binary files a/ixmp/backend/jdbc/idxjni64.dll and /dev/null differ diff --git a/ixmp/backend/jdbc/utiljni64.dll b/ixmp/backend/jdbc/utiljni64.dll deleted file mode 100644 index 0c48f3916..000000000 Binary files a/ixmp/backend/jdbc/utiljni64.dll and /dev/null differ