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# OpenTTD's Symbol Server
For all official releases, OpenTTD collects the Breakpad Symbols (SYM-files) and Microsoft's Symbols (PDB-files), and publishes them on our own Symbol Server (https://symbols.openttd.org).
These symbol files are needed to analyze `crash.dmp` files as attached to issues by users.
A `crash.dmp` is created on Windows, Linux, and MacOS when a crash happens.
This combined with the `crash.log` should give a pretty good indication what was going on at the moment the game crashed.
## Analyzing a crash.dmp
### MSVC
In MSVC you can add the above URL as Symbol Server (and please enable MSVC's for all other libraries), allowing you to analyze `crash.dmp`.
Now simply open up the `crash.dmp`, and start debugging.
### All other platforms
The best tool to use is `minidump-stackwalk` as published in the Rust's cargo index:
```bash
cargo install --locked minidump-stackwalk
```
For how to install Rust, please see [here](https://doc.rust-lang.org/cargo/getting-started/installation.html).
Now run the tool like:
```bash
minidump-stackwalk <crash.dmp> --symbols-url https://symbols.openttd.org
```
For convenience, the above Symbol Server also check with Mozilla's Symbol Server in case any other library but OpenTTD is requested.
This means files like `libc`, `kernel32.dll`, etc are all available on the above mentioned Symbol Server.
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