Studio Express uses three files:
- Project Files: These files are used to store all of your project data including the IDF curves and design storm precipitation data that were being used at the time the project was last saved. Project files have a “.stx” extension.
- IDF curve files: These files store the IDF curves and have an “.idf” extension. These are the same .idf files used in other Hydrology Studio software and can be opened and used in Studio Express.
- Precipitation files: These contain your precipitation data for the design storms and have a “.pcp” extension.
The IDF and Precipitation data is automatically embedded within the Project Files (.stx).

Saving Projects
Studio Express works much like a spreadsheet or word processor. To save a project, select “Save Project” from the “File” menu. If you are saving this file for the first time, select “Save Project As…”. When using “Save Project” the program will automatically save the project under its current name.
Opening Projects
To access a project, click on “Open Project” in the “File” menu. Alternatively, you can choose a project from the Recent Projects list, which displays up to five of your most recently opened projects. To delete a project from this list, right-click on it and select “Remove from list.”
Keep in mind that projects cannot be opened by double-clicking the file name outside of Studio Express.