A NSM file is a kind of data file primarily associated with the Nessus Security Scanner. Nessus Security Scanner is a security auditing tool built for network administrators to check for vulnerabilities on the systems connected to a network. Apart from this, NSM also caters to the Netshow Manager Document developed by Microsoft Corporation.
Nessus Security Scanner
The main program that uses the NSM extension is Nessus, developed by Tenable Network Security. It is an open-source tool used for vulnerability scanning - its main purpose is to analyze systems for possible vulnerabilities that could be exploited by attackers. When Nessus performs a scan, the results are often saved into an NSM file format. More information can be found here.
To open and use NSM files associated with Nessus, you would need to have the Nessus software installed on your device. Once installed, you can import the NSM file directly into Nessus for review. If you do not have Nessus, other alternatives might come in handy such as OVAL Interpreter and Protovision Greenbone Security Assistant, which can interpret NSM files.
Netshow Manager Document
On the other hand, NSM files may also refer to a Netshow Manager Document file type. This is associated with the Microsoft Netshow Services software, which was a former media streaming solution before it was succeeded by the Windows Media Services. More information about the Microsoft Netshow Services software can be found in the Microsoft Media Services Wikipedia page.
To open and use an NSM file in this context, you would need to have the Microsoft Netshow Services or Windows Media Services software installed on your device. It noteworthy though, these NSM files are rare since the software has been discontinued.
NSM File Important Information
Despite the potential of NSM files to contain critical information, whether it be network vulnerability data or media streaming details, it's worth remembering that these should never be opened without certainty of their source. Illegitimate NSM files may potentially carry dangerous exploits to systems.
Guarantee that your Nessus or Microsoft Netshow Services software is always up to date to ensure that it can handle and manage NSM files appropriately. If you encounter problems opening your NSM files, consult with a professional or look for online communities, such as the Tenable Community or Microsoft Answer.