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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ASP | Microsoft Corporation | Web Files | Active Server Page | Microsoft IIS | Microsoft Corporation |
| .CRL | Various Developers | Web Files | Certificate Revocation List File | Microsoft IIS | Microsoft Corporation |
| .CSR | Open Source | Web Files | Certificate Signing Request File | Microsoft IIS | Microsoft Corporation |
| .HTW | Microsoft Corporation | Data Files | IIS Webhits Template | Microsoft IIS | Microsoft Corporation |
| .IDA | Microsoft Corporation | Data Files | Microsoft IIS Server Data | Microsoft IIS | Microsoft Corporation |
| .IDC | Pierre-Emmanuel Gougelet | Uncommon Files | Core Software Tech IDC File | Microsoft IIS | Microsoft Corporation |
| .ISM | Microsoft Corporation | Video Files | IIS Smooth Streaming Manifest File | Microsoft IIS | Microsoft Corporation |
| .ISP | Microsoft Corporation | Settings Files | IIS Internet Service Provider Settings | Microsoft IIS | Microsoft Corporation |
| .MSPX | Microsoft Corporation | Web Files | Microsoft ASP.NET Web Page | Microsoft IIS | Microsoft Corporation |
| .P12 | RSA Laboratories | Web Files | Personal Information Exchange File | Microsoft IIS | Microsoft Corporation |
| .PEM | Microsoft Corporation | Web Files | Privacy Enhanced Mail Certificate | Microsoft IIS | Microsoft Corporation |
| .PRF | Microsoft Corporation | Settings Files | Outlook Profile File | Microsoft IIS | Microsoft Corporation |
| .STL | 3D Systems | CAD Files | Stereolithography File | Microsoft IIS | Microsoft Corporation |
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