What is DLL? DLL, short name for Dynamic Link Library, is used as the file extension for Dynamic Link Library files. .DLL files are binary files that can be created by Windows application development tools. See the sample .DLL file included below.

File Extension: .DLL

MIME Type: application/octet-stream

File Content: Dynamic Link Library

.DLL files are Dynamic Link Library files saved as binary files. Here are the first 128 bytes of a sample .DLL file dumped in HEX values:

4d 5a 90 00 03 00 00 00 04 00 00 00 ff ff 00 00 MZ..............
b8 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 e8 00 00 00 ................
0e 1f ba 0e 00 b4 09 cd 21 b8 01 4c cd 21 54 68 ...........L..Th
69 73 20 70 72 6f 67 72 61 6d 20 63 61 6e 6e 6f is.program.canno
74 20 62 65 20 72 75 6e 20 69 6e 20 44 4f 53 20 t.be.run.in.DOS.
6d 6f 64 65 2e 0d 0d 0a 24 00 00 00 00 00 00 00 mode............

.DLL Dynamic Link Library file sample: Click sample.dll to download.

.DLL Dynamic Link Library files can be created and modified by these software:

• MS Visual Studio - Creates .DLL Dynamic Link Library files.