User Manuals
The Thunar Project Wiki contains documentation for users, including installation instructions, tips and tricks, frequently asked questions, and more.
The still rather incomplete user guide is also available online in the following languages:
Developer Manuals
Reference manuals for thunar-vfs (the file system abstraction
library used by Thunar) and thunarx (the Thunar Extension
Framework) are available for developers interested to develop for Thunar
or enhance their own applications using the functionality provided by
Thunar libraries and/or Thunar plugins. Note that the library interface
described in the manuals is not yet frozen and may still change before
the 1.0 release.
Be sure to check out the Development Wiki, which contains interesting notes about the architecture and the design of Thunar.