| Tool | Best For | DLL Type | Cost | Accuracy | |------|----------|----------|------|----------| | dnSpy | .NET reverse engineering | Managed | Free | Excellent (95%+) | | ILSpy | Batch .NET decompilation | Managed | Free | Very Good | | dotPeek | Navigation & search | Managed | Free | Very Good | | Ghidra | Native C++ decompilation | Unmanaged | Free | Good (75-85%) | | IDA Pro + Hex-Rays | Professional native analysis | Unmanaged | $1,500+ | Excellent (90%+) | | x64dbg + Snowman | Debugging + live decomp | Unmanaged | Free | Fair (60-70%) |
You have a legacy accounting application that crashes when printing invoices. The developer went out of business. You have InvoicePrinter.dll (unknown type).
If you are decompiling a DLL that you wrote and lost the source code for, or an open-source DLL (GPL/LGPL), you are ethically and legally clear.
| Tool | Best For | DLL Type | Cost | Accuracy | |------|----------|----------|------|----------| | dnSpy | .NET reverse engineering | Managed | Free | Excellent (95%+) | | ILSpy | Batch .NET decompilation | Managed | Free | Very Good | | dotPeek | Navigation & search | Managed | Free | Very Good | | Ghidra | Native C++ decompilation | Unmanaged | Free | Good (75-85%) | | IDA Pro + Hex-Rays | Professional native analysis | Unmanaged | $1,500+ | Excellent (90%+) | | x64dbg + Snowman | Debugging + live decomp | Unmanaged | Free | Fair (60-70%) |
You have a legacy accounting application that crashes when printing invoices. The developer went out of business. You have InvoicePrinter.dll (unknown type). how to decompile dll file
If you are decompiling a DLL that you wrote and lost the source code for, or an open-source DLL (GPL/LGPL), you are ethically and legally clear. | Tool | Best For | DLL Type