IM File Extension

IM file icon

SunOS Grey Scale Bitmap

What is a IM file?

SunOS Grey Scale Bitmap, identified by the IM extension, is a Raster Image Files type and includes 575 files.

The SunOS Grey Scale Bitmap (IM) was developed by Sun Microsystems, which created file format and 4 programs to work with them.

IM file support extends to various operating systems, including Windows, Linux and Mac OS. To view a IM file, you can choose from 2 programs such as XnView and SunOS.

Programs that support IM files

Windows logo

Windows

Mac OS logo

Mac OS

How to open a IM file?

If you cannot open a IM file, it is most often due to missing software. Select a program from the list according to your operating system. Then go to the official website of the program developer, download it, and install it on your device.

When it comes to opening and working with IM files, XnView and SunOS are the top choices for users. If you want the most recent release of SunOS, head over to the Sun Microsystems site and download the version designed to run on all platforms.

After installation, your operating system should automatically open IM files with SunOS.

Setting SunOS as default IM viewer

Changing Default Programs in Windows

  1. Right click on your IM file, then select "Open with" and click "Choose another application";
  2. Choose SunOS from the available applications listed in the pop-up window to set it as the default application to open your IM file;
  3. Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.

Change the default app for a file type in Mac

  1. Initiate a right click or use Control + left click on the desired IM file to open a menu where you can select various actions;
  2. Select "Open in application" and click "Other";
  3. Next, at the bottom of the window, you will see the "Enable" menu, in which "Recommended Programs" is selected by default;
  4. In this menu, select "All Programs", then find SunOS and check the box next to "Always open in the application."

How to edit a IM file?

To edit IM files, it is essential to install software that supports not only viewing but also editing the raster image files. Online IM editors provide limited functionality compared to full-featured software for SunOS Grey Scale Bitmap.

List of Top IM editors 2026

Based on these criteria, we have prepared a list of available IM editors.

IM Editor SoftwareDeveloperPlatformsOverall Rating
SunOSSun MicrosystemsLinux4.8 out of 5 (38 reviews)

Tips and tricks to solve problems with IM files

There are some common issues with IM files that can be resolved easily by making minor adjustments to your software. Below, you’ll find these issues along with practical troubleshooting tips.

What Causes SunOS to Crash Frequently?

The likely cause of SunOS crashing is lack of software updates. Install the latest updates available for Sun Microsystems products.

Restarting your computer is an essential troubleshooting step that can resolve many common problems. It is recommended to restart your computer before making any changes to the software settings.

How can I restore a damaged IM file?

Open the corrupted IM file in a recovery program and select the "Repair" menu item. Wait for the recovery process to finish, as it will automatically repair damaged raster image files.

How do I know if my IM file is corrupted?

Common indications of damaged IM raster image files are:

  • The file shows errors when trying to open it or does not open completely;
  • Editing the archive in SunOS results in slow or unresponsive behavior;
  • Opening or processing the file in SunOS or other programs causes instability or crashes in the program;
  • Unexpected expansion of the total size of the IM file;
  • Error messages appear while working with the file;