The File Extensions Database

.ISM File Extension

  • Developer by: Microsoft
  • Category: Video Files
  • Format: XML

What is an .ISM file?

.ISM is IIS Smooth Streaming Manifest File

File used by the Smooth Streaming extension of Microsoft's IIS Web server; uses XML formatting and contains bit rate and track information for audio (.ISMA) and video (.ISMV) files hosted on the Web server for streaming; saved in the same server directory as the multimedia files; allows the server to know which bit rates map to which multimedia files, which is useful for determining the streaming quality after negotiating the connection speed with a client.

ISM files are often referenced in Silverlight and other streaming applications for accessing video or audio streams. In the Smooth Streaming API, the SmoothStreamingSource is used to specify a streaming source for a SmoothStreamingMediaElement (SSME) that streams the multimedia content.

NOTE: ISM files are generated using Expression Encoder, a program that creates the multimedia content in addition to the manifests.

Programs that open IIS Smooth Streaming Manifest File
Microsoft IIS
File Type 2:

InstallShield Project File

Developer by: Flexera Software Category: Developer Files Format: XML

Project file created by InstallShield, a program used to create Windows installers; contains all project settings and code, including directory structures, file names, custom scripts, and installer dialog settings; used to build an installation package.

ISM files can be saved in either a binary format or an XML format.

NOTE: ISM files are created by the Premiere and Professional editions of InstallShield.

Programs that open InstallShield Project File
Flexera InstallShield

How to solve problems with ISM files

  • Associate the ISM file extension with the correct application. On :
    Windows: Right click on any ISM file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ISM files". Mac: Right click (or Ctrl-click) the ISM file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .ISM is IIS Smooth Streaming Manifest File. Because only the current version supports the latest ISM file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .ISM is IIS Smooth Streaming Manifest File update.
  • To make sure that your ISM file is not corrupted or virus-infected, get the file again and scan it with antivirus software.