THM File Extension
Thumbnail Image Format
- File Type thm
- Developer Sony Ericsson
- Popularity
- Application Sony Ericsson Theme Creator
- Category Smartphone Files, Settings Files
What is a THM file?
Thumbnail Image Format works with the THM file extension and is classified under Smartphone Files and Settings Files, with a total of 1259 files.
With the creation of the Thumbnail Image Format (THM), Sony Ericsson introduced file format along with 4 programs built for their use.
THM files are compatible with various operating systems, including Windows. You can open a THM file using one of 3 programs, for example Sony Ericsson Theme Creator, Sony Ericsson PC Suite and Theme Creator Pro.
MIME types
- application/vnd.eri.thm
File Signature
HEX code: 75 73 74 61 72. ASCII code: ustar.
Programs that support THM files
How to open a THM file?
The most common reason why a THM file cannot be opened is the absence of required software. To fix this, select a compatible program from the list. Then visit the official developer website via the provided link, download the program, and install it on your system.
Sony Ericsson Theme Creator, Sony Ericsson PC Suite and Theme Creator Pro are recognized as the most popular software solutions for dealing with THM files. To install the most up-to-date edition of Sony Ericsson Theme Creator, visit the official Sony Ericsson website. You can download the build that works across all operating systems.
After completing the installation, THM files should be recognized by the system and linked to Sony Ericsson Theme Creator.
Set Sony Ericsson Theme Creator as the default THM program
Setting a default program by file type in Windows
- Start by right-clicking on your THM file and selecting the "Open With" option. From there, click "Choose another app" to continue;
- In the pop-up window, select the Sony Ericsson Theme Creator application;
- Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening THM files.
Change Default Program on Mac
- Right click or Control + left click on the desired THM file;
- Select "Open in application" and click "Other";
- In the lower section of the window, you’ll find the "Enable" menu, with "Recommended Programs" pre-selected as the default option;
- Select "All Programs" in this menu, and then search for Sony Ericsson Theme Creator. Check the box next to "Always open in app" to make sure it’s the default option.
How to edit a THM file?
Editing THM files requires installing professional software that lets you open and edit smartphone files. Online editors have more limitations compared to dedicated Thumbnail Image Format programs.
Best THM editors in 2026
Taking the above factors into account, we have selected a list of THM editors currently available.
| THM Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Sony Ericsson PC Suite | Sony Ericsson | Windows | 4.7 out of 5 (50 reviews) |
| Sony Ericsson Theme Creator | Sony Ericsson | Windows | 4.6 out of 5 (45 reviews) |
| Theme Creator Pro | Slavko Solar | Windows | 4.2 out of 5 (42 reviews) |
Solve problems with THM files
While THM files can sometimes present difficulties, most problems can be resolved quickly with minor software modifications. Check the tips below to help solve them.
Are there any techniques or tools available to repair a damaged THM file?
Use a recovery program to open the damaged THM file and navigate to the "Repair" menu item. Then wait for the recovery process to complete, which allows you to automatically repair corrupted smartphone files.
What are the signs that my THM file is damaged?
Corrupted THM smartphone files may show the following signs:
- Editing the archive in Sony Ericsson Theme Creator is accompanied by slow performance or delays;
- File hangs or crashes in Sony Ericsson Theme Creator or other programs;
- The file does not open or opens with errors;
- Unexplained increase in THM file size;
- Working with the file triggers the display of error messages;
What factors contribute to Sony Ericsson Theme Creator crash?
Sony Ericsson Theme Creator crashes can be attributed to outdated software. Make sure you have installed the latest updates for Sony Ericsson products.
Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.