There are times when you would want the IIS web server to serve a file that has an extension that it does not recognize. That is, a file whose mime type has not been defined. In such a case, IIS would return http error code, 404.3. For the web server to serve the file with that new extension, you need to create a mapping between that extension and the MIME type.
The following MIME types are some MIME types with its File Extension and Content type.
| File Extension | Content type (MIME) |
| .323 | text/h323 |
| .aaf | application/octet-stream |
| .aca | application/octet-stream |
| .acx | application/internet-property-stream |
| .afm | application/octet-stream |
| .ai | application/postscript |
| .aif | audio/x-aiff |
| .aifc | audio/aiff |
| .aiff | audio/aiff |
| .applicati | application/x-ms-application |
| .art | image/x-jg |
| .asd | application/octet-stream |
| .asf | video/x-ms-asf |
| .asi | application/octet-stream |
| .asm | text/plain |
| .asr | video/x-ms-asf |
| .asx | video/x-ms-asf |
| .au | audio/basic |
| .avi | video/x-msvideo |
| .axs | application/olescript |
| .bas | text/plain |
| .bcpio | application/x-bcpio |
| .bin | application/octet-stream |
| .bmp | image/bmp |
| .c | text/plain |
| .cab | application/octet-stream |
| .cat | application/vnd.ms-pki.seccat |
| .cdf | application/x-cdf |
| .chm | application/octet-stream |
| .class | application/x-java-applet |
| .clp | application/x-msclip |
| .cmx | image/x-cmx |
| .cnf | text/plain |
| .cod | image/cis-cod |
| .cpio | application/x-cpio |
| .cpp | text/plain |
| .crd | application/x-mscardfile |
| .crl | application/pkix-crl |
| .crt | application/x-x509-ca-cert |
| .csh | application/x-csh |
| .css | text/css |
| .csv | application/octet-stream |
| .cur | application/octet-stream |
| .dcr | application/x-director |
| .deploy | application/octet-stream |
| .der | application/x-x509-ca-cert |
| .dib | image/bmp |
| .dir | application/x-director |
| .disco | text/xml |
| .dll | application/x-msdownload |
| .dlm | text/dlm |
| .dnl | application/x-msdownload |
| .doc | application/msword |
| .dot | application/msword |
| .dsp | application/octet-stream |
| .dtd | text/xml |
| .dvi | application/x-dvi |
| .dwf | drawing/x-dwf |
| .dwp | application/octet-stream |
| .dxr | application/x-director |
| .easm | application/octet-stream |
| .eml | message/rfc822 |
| .emz | application/octet-stream |
| .eot | application/octet-stream |
| .eps | application/postscript |
| .etx | text/x-setext |
| .evy | application/envoy |
| .ex_ | application/octet-stream |
| .exe | application/octet-stream |
| .fdf | application/vnd.fdf |
| .fif | application/fractals |
| .fla | application/octet-stream |
| .flr | x-world/x-vrml |
| .flv | video/x-flv |
| .gif | image/gif |
| .gtar | application/x-gtar |
| .gz | application/x-gzip |
| .h | text/plain |
| .hdf | application/x-hdf |
| .hdml | text/x-hdml |
| .hhc | application/x-oleobject |
| .hhk | application/octet-stream |
| .hhp | application/octet-stream |
| .hlp | application/winhlp |
| .hqx | application/mac-binhex40 |
| .hsf | application/octet-stream |
| .hta | application/hta |
| .htc | text/x-component |
| .htm | text/html |
| .html | text/html |
| .htt | text/webviewhtml |
| .hxt | text/html |
| .ica | application/x-ica |
| .ico | image/x-icon |
| .ics | application/octet-stream |
| .ief | image/ief |
| .inf | application/octet-stream |
| .ins | application/x-internet-signup |
| .isp | application/x-internet-signup |
| .IVF | video/x-ivf |
| .jar | application/java-archive |
| .java (Disabled in IIS 7) | application/octet-stream |
| .jck | application/liquidmotion |
| .jcz | application/liquidmotion |
| .jfif | image/pjpeg |
| .jpb | application/octet-stream |
| .jpe | image/jpeg |
| .jpeg | image/jpeg |
| .jpg | image/jpeg |
| .js | application/x-javascript |
| .latex | application/x-latex |
| .lit | application/x-ms-reader |
| .lpk | application/octet-stream |
| .lsf | video/x-la-asf |
| .lsx | video/x-la-asf |
| .lzh | application/octet-stream |
| .m13 | application/x-msmediaview |
| .m14 | application/x-msmediaview |
| .m1v | video/mpeg |
| .m3u | audio/x-mpegurl |
| .man | application/x-troff-man |
| .manifest | application/x-ms-manifest |
| .map | text/plain |
| .mdb | application/x-msaccess |
| .mdp | application/octet-stream |
| .me | application/x-troff-me |
| .mht | message/rfc822 |
| .mhtml | message/rfc822 |
| .mid | audio/mid |
| .midi | audio/mid |
| .mix | application/octet-stream |
| .mmf | application/x-smaf |
| .mno | text/xml |
| .mny | application/x-msmoney |
| .mov | video/quicktime |
| .movie | video/x-sgi-movie |
| .mp2 | video/mpeg |
| .mp3 | audio/mpeg |
| .mp4 | audio/mpeg |
| .mpa | video/mpeg |
| .mpe | video/mpeg |
| .mpeg | video/mpeg |
| .mpg | video/mpeg |
| .mpp | application/vnd.ms-project |
| .mpv2 | video/mpeg |
| .ms | application/x-troff-ms |
| .msi | application/octet-stream |
| .mvb | application/x-msmediaview |
| .nc | application/x-netcdf |
| .nsc | video/x-ms-asf |
| .nws | message/rfc822 |
| .ocx | application/octet-stream |
| .oda | application/oda |
| .ods | application/oleobject |
| .p10 | application/pkcs10 |
| .p12 | application/x-pkcs12 |
| .p7b | application/x-pkcs7-certificates |
| .p7c | application/pkcs7-mime |
| .p7m | application/pkcs7-mime |
| .p7r | application/x-pkcs7-certreqresp |
| .p7s | application/pkcs7-signature |
| .pbm | image/x-portable-bitmap |
| .pcx | application/octet-stream |
| .pcz | application/octet-stream |
| application/pdf | |
| .pfb | application/octet-stream |
| .pfm | application/octet-stream |
| .pfx | application/x-pkcs12 |
| .pgm | image/x-portable-graymap |
| .pko | application/vnd.ms-pki.pko |
| .pma | application/x-perfmon |
| .pmc | application/x-perfmon |
| .pml | application/x-perfmon |
| .pmr | application/x-perfmon |
| .pmw | application/x-perfmon |
| .png | image/png |
| .pnm | image/x-portable-anymap |
| .pnz | image/png |
| .pot | application/vnd.ms-powerpoint |
| .ppm | image/x-portable-pixmap |
| .pps | application/vnd.ms-powerpoint |
| .ppt | application/vnd.ms-powerpoint |
| .prf | application/pics-rules |
| .prm | application/octet-stream |
| .prx | application/octet-stream |
| .ps | application/postscript |
| .psd | application/octet-stream |
| .psm | application/octet-stream |
| .psp | application/octet-stream |
| .pub | application/x-mspublisher |
| .qt | video/quicktime |
| .qtl | application/x-quicktimeplayer |
| .qxd | application/octet-stream |
| .ra | audio/x-pn-realaudio |
| .ram | audio/x-pn-realaudio |
| .rar | application/octet-stream |
| .ras | image/x-cmu-raster |
| .rdf | application/rdf+xml |
| .rf | image/vnd.rn-realflash |
| .rgb | image/x-rgb |
| .rm | application/vnd.rn-realmedia |
| .rmi | audio/mid |
| .roff | application/x-troff |
| .rpm | audio/x-pn-realaudio-plugin |
| .rtf | application/rtf |
| .rtx | text/richtext |
| .scd | application/x-msschedule |
| .sct | text/scriptlet |
| .sea | application/octet-stream |
| .setpay | application/set-payment-initiation |
| .setreg | application/set-registration-initiation |
| .sgml | text/sgml |
| .sh | application/x-sh |
| .shar | application/x-shar |
| .sit | application/x-stuffit |
| .sldasm | application/octet-stream |
| .sldprt | application/octet-stream |
| .smd | audio/x-smd |
| .smi | application/octet-stream |
| .smx | audio/x-smd |
| .smz | audio/x-smd |
| .snd | audio/basic |
| .snp | application/octet-stream |
| .spc | application/x-pkcs7-certificates |
| .spl | application/futuresplash |
| .src | application/x-wais-source |
| .ssm | application/streamingmedia |
| .sst | application/vnd.ms-pki.certstore |
| .stl | application/vnd.ms-pki.stl |
| .sv4cpio | application/x-sv4cpio |
| .sv4crc | application/x-sv4crc |
| .svg | application/octet-stream |
| .swf | application/x-shockwave-flash |
| .t | application/x-troff |
| .tar | application/x-tar |
| .tcl | application/x-tcl |
| .tex | application/x-tex |
| .texi | application/x-texinfo |
| .texinfo | application/x-texinfo |
| .tgz | application/x-compressed |
| .thn | application/octet-stream |
| .tif | image/tiff |
| .tiff | image/tiff |
| .toc | application/octet-stream |
| .tr | application/x-troff |
| .trm | application/x-msterminal |
| .tsv | text/tab-separated-values |
| .ttf | application/octet-stream |
| .txt | text/plain |
| .u32 | application/octet-stream |
| .uls | text/iuls |
| .ustar | application/x-ustar |
| .vbs | text/vbscript |
| .vcf | text/x-vcard |
| .vcs | text/plain |
| .vdx | application/vnd.visio |
| .vml | text/xml |
| .vsd | application/vnd.visio |
| .vss | application/vnd.visio |
| .vst | application/vnd.visio |
| .vsw | application/vnd.visio |
| .vsx | application/vnd.visio |
| .vtx | application/vnd.visio |
| .wav | audio/wav |
| .wax | audio/x-ms-wax |
| .wbmp | image/vnd.wap.wbmp |
| .wcm | application/vnd.ms-works |
| .wdb | application/vnd.ms-works |
| .wks | application/vnd.ms-works |
| .wm | video/x-ms-wm |
| .wma | audio/x-ms-wma |
| .wmd | application/x-ms-wmd |
| .wmf | application/x-msmetafile |
| .wml | text/vnd.wap.wml |
| .wmlc | application/vnd.wap.wmlc |
| .wmls | text/vnd.wap.wmlscript |
| .wmlsc | application/vnd.wap.wmlscriptc |
| .wmp | video/x-ms-wmp |
| .wmv | video/x-ms-wmv |
| .wmx | video/x-ms-wmx |
| .wmz | application/x-ms-wmz |
| .world | application/octet-stream |
| .wps | application/vnd.ms-works |
| .wri | application/x-mswrite |
| .wrl | x-world/x-vrml |
| .wrz | x-world/x-vrml |
| .wsdl | text/xml |
| .wvx | video/x-ms-wvx |
| .x | application/directx |
| .xaf | x-world/x-vrml |
| .xbm | image/x-xbitmap |
| .xdr | text/plain |
| .xla | application/vnd.ms-excel |
| .xlc | application/vnd.ms-excel |
| .xlm | application/vnd.ms-excel |
| .xls | application/vnd.ms-excel |
| .xlt | application/vnd.ms-excel |
| .xlw | application/vnd.ms-excel |
| .xml | text/xml |
| .xof | x-world/x-vrml |
| .xpm | image/x-xpixmap |
| .xsd | text/xml |
| .xsf | text/xml |
| .xsl | text/xml |
| .xslt | text/xml |
| .xsn | application/octet-stream |
| .xwd | image/x-xwindowdump |
| .z | application/x-compress |
| .zip | application/x-zip-compressed |
I just want to say after downloading
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and worry about how to save the file. If you were looking for open .mpg file https://wikiext.com/mpg this program will definitely simplify the work with any files. I did it and installed such a viewer on a working and my own laptop. No problems...