What is a .O file?
A .o file is compiled object code, linked together to build a program.
- Did you know
- Object files hold machine code that the linker stitches into a finished program.
- Object files are relocatable rather than directly runnable, holding code and data plus a symbol table and relocation entries for the linker to resolve.
- Common object-file containers include ELF on Linux and Unix, Mach-O on macOS and COFF-derived formats on Windows.
- What Analyser reads
- Inspect virtual-machine descriptors (VMware .vmx, VirtualBox .vbox, OVF/OVA), disc images (Nero .nrg, Alcohol .mds/.mdf, CloneCD), embedded firmware (Intel HEX, Motorola S-record, UF2, ELF/AXF, Device Tree Blobs, U-Boot uImage), partition tables (MBR/GPT with GUIDs), Linux filesystem superblocks (ext2/3/4, SquashFS, cramfs, romfs) and Windows imaging (WIM/ESD) - reading headers directly, no upload.
- Depth of analysis
- .O is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .O file
- Drag a .O file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.