| TechTarget file types | art-336 | XSS-Ability-Office-spreadsheet-file |
| TechTarget file types | art-336 | XSS-Cross-Stitch-Professional-design-file |
| filename extensions | art-335 | xsslog |
| TechTarget file types | art-336 | XSSLOG-Microsoft-Office-Groove-file |
| TechTarget file types | art-336 | XSS-Microsoft-Visual-Studio-XSS-file |
| filename extensions | art-335 | xssr |
| TechTarget file types | art-336 | XSSR-Microsoft-Office-Groove-file |
| ISO 639 | art-005 | xst |
| ISO 639-3 Retired Code Elements | art-324 | xst |
| filename extensions | art-335 | xst |
| English | eng-000 | X. standards |
| English | eng-000 | X-state |
| English | eng-000 | X-static yarn |
| English | eng-000 | X-Statix |
| português | por-000 | X-Statix |
| TechTarget file types | art-336 | XST-Easy-Cross-Cross-Stitch-Design |
| English | eng-000 | Xsteel drawing file |
| Tsimshian | tsi-000 | xsteltk |
| filename extensions | art-335 | xstep |
| English | eng-000 | XStep DWI Maker File |
| TechTarget file types | art-336 | XSTEP-XStep-DWI-Maker-File |
| séliš | fla-000 | x̣stéyy̓eʔ |
| English | eng-000 | X-stitch embroidered pillowcase |
| English | eng-000 | XStones |
| Tsimshian | tsi-000 | xstˀook |
| English | eng-000 | X-stopper |
| English | eng-000 | XSTR |
| English | eng-000 | xstr |
| Nederlands | nld-000 | x-straal |
| Afrikaans | afr-000 | X-straalfoto |
| Afrikaans | afr-000 | X-straalplaat |
| Deutsch | deu-000 | X-Strahl |
| Deutsch | deu-000 | X-Strahlen |
| Deutsch | deu-000 | X-Strahlen-Burst |
| Afrikaans | afr-000 | X-strale |
| Nederlands | nld-000 | X-stralen |
| Nederlands | nld-000 | x-stralen |
| Esperanto | epo-000 | Xstrata |
| français | fra-000 | Xstrata |
| español | spa-000 | Xstrata |
| Deutsch | deu-000 | XStream |
| English | eng-000 | XStream |
| TechTarget file types | art-336 | XST-Tanner-Ledit-Crossview-data |
| Old Avestan | ave-001 | xštva |
| TechTarget file types | art-336 | XST-WebSphere-Query-Template |
| TechTarget file types | art-336 | XST-X-Tract-XML-script-file |
| Luhua | cng-006 | xstə |
| asturianu | ast-000 | XSU |
| brezhoneg | bre-000 | XSU |
| čeština | ces-000 | XSU |
| 國語 | cmn-001 | XSU |
| Deutsch | deu-000 | XSU |
| suomi | fin-000 | XSU |
| français | fra-000 | XSU |
| Gàidhlig | gla-000 | XSU |
| Gaeilge | gle-000 | XSU |
| hrvatski | hrv-000 | XSU |
| 日本語 | jpn-000 | XSU |
| Nederlands | nld-000 | XSU |
| bokmål | nob-000 | XSU |
| ภาษาไทย | tha-000 | XSU |
| Türkçe | tur-000 | XSU |
| Qiāngyǔ Púxīhuà | qxs-003 | Xsu |
| ISO 639-3 | art-001 | xsu |
| filename extensions | art-335 | xsu |
| ISO 639-PanLex | art-274 | xsu-000 |
| Old Avestan | ave-001 | xšudra- |
| TechTarget file types | art-336 | XSU-Fortran-Libf77-file |
| Yorno-So | dts-001 | X súgɔ́-nɛ́ |
| Togo-Kan | dtk-002 | X súgɛ́:ⁿ |
| suomi | fin-000 | X-sukupolvi |
| Q’eqchi’ | kek-000 | xsumenkil |
| TechTarget file types | art-336 | XS-Unknown-Apple-II-File |
| Q’eqchi’ | kek-000 | xsu oq |
| Taoping | cng-000 | xsuSC |
| Yadu | cng-010 | xsu-su |
| Avestan | ave-000 | xšuuaš |
| Kwikapa | coc-000 | xsuur |
| ISO 15924 Code | art-262 | Xsux |
| Unicode Property Value Aliases | art-318 | Xsux |
| Kwikapa | coc-000 | x=suːɾ |
| Tsimshian | tsi-000 | xsuʔusk |
| ISO 639-3 | art-001 | xsv |
| ISO 639-PanLex | art-274 | xsv-000 |
| Old Avestan | ave-001 | xšvaš |
| Avestan | ave-000 | xṣ̌vaš |
| Old Avestan | ave-001 | xšvašdasa |
| Deutsch | deu-000 | XSVCD |
| polski | pol-000 | XSVCD |
| filename extensions | art-335 | xsvf |
| Old Avestan | ave-001 | xšvid- |
| Old Avestan | ave-001 | xšvīd- |
| Old Avestan | ave-001 | xšviwra- |
| filename extensions | art-335 | xsw |
| English | eng-000 | X-sweep |
| TechTarget file types | art-336 | XSW-Milnta-APL-Transfer-Function |
| Tsimshian | tsi-000 | xswooxsk |
| filename extensions | art-335 | xsx |
| TechTarget file types | art-336 | XSX-Schema-view-layout-description-file-Microsoft-XML-Designer |
| ISO 639-3 | art-001 | xsy |
| ISO 639-PanLex | art-274 | xsy-000 |
| ISO 639-PanLex | art-274 | xsy-001 |
| ISO 639-PanLex | art-274 | xsy-002 |
| Latina Nova | lat-003 | Xsylina freyeri |
| English | eng-000 | X syndrome |
| English | eng-000 | Xsys doc file |
| English | eng-000 | Xsys document file |
| English | eng-000 | Xsys file |
| Luoxiang | cng-007 | xsyst |
| Mawo | cng-001 | xsæ |
| Luhua | cng-006 | xsæ |
| Luoxiang | cng-007 | xsæ |
| Luhua | cng-006 | xsæn |
| Luhua | cng-006 | xsæpɑ |
| Luhua | cng-006 | xsæʴ |
| Weigu | cng-011 | xsɑdʐmi |
| Togo-Kan | dtk-002 | X sɔ́: |
| Perge Tegu | djm-004 | [X sɔ́rⁿú] yòŋgòró |
| Mawo | cng-001 | xsə |
| Luhua | cng-006 | xsə |
| Luoxiang | cng-007 | xsə |
| Wabo | cng-008 | xsə |
| Yadu | cng-010 | xsə |
| Weigu | cng-011 | xsə |
| Wabo | cng-008 | xsə dzus |
| Luhua | cng-006 | xsə dʐi |
| Luhua | cng-006 | xsə kʰi |
| Luoxiang | cng-007 | xsəkʰi |
| Weigu | cng-011 | xsə kʰəʴ |
| Wabo | cng-008 | xsəkʰəʴ |
| Weigu | cng-011 | xsəm |
| Luoxiang | cng-007 | xsəq |
| Wabo | cng-008 | xsəq |
| Weigu | cng-011 | xsəq |
| Weigu | cng-011 | xsə stu |
| Luoxiang | cng-007 | xsəstu̥ |
| Wabo | cng-008 | xsəstu̥ |
| Luhua | cng-006 | xsə su |
| Weigu | cng-011 | xsə su |
| Luoxiang | cng-007 | xsəsu |
| Wabo | cng-008 | xsəsu |
| Wabo | cng-008 | xsəsu mæχæ |
| Yadu | cng-010 | xsə-sɑ |
| Yadu | cng-010 | xsəts |
| Luhua | cng-006 | xsə tu |
| Yadu | cng-010 | xsə tɕi |
| Luoxiang | cng-007 | xsətʂ |
| Wabo | cng-008 | xsətʂ |
| Luhua | cng-006 | xsəwæ |
| Wabo | cng-008 | xsəɕ |
| Yadu | cng-010 | xsə ɕtɕə |
| Wabo | cng-008 | xsə ɕʨe |
| Weigu | cng-011 | xsə ɤdʐu |
| Wabo | cng-008 | xsəɤdʐu̥ |
| Wabo | cng-008 | xsə ɤzu |
| Weigu | cng-011 | xsə ɤzuk |
| Luhua | cng-006 | xsəʴ |
| Luoxiang | cng-007 | xsəʴ |
| Luhua | cng-006 | xsə ʨʰɑʨʰə |
| Wabo | cng-008 | xsəʨi |
| Weigu | cng-011 | xsə χɑw |
| Perge Tegu | djm-004 | X sɛ́:-sà |
| English | eng-000 | XT |
| English | eng-000 | Xt. |
| filename extensions | art-335 | x_t |
| filename extensions | art-335 | xt |
| Middle Egyptian | egy-003 | xt |
| 日本語 | jpn-000 | xt |
| ISO 639-3 | art-001 | xta |
| تشلحيت | shi-000 | xta |
| Tacelḥit | shi-001 | xta |
| Hñähñu | ote-000 | xtä |
| ISO 639-PanLex | art-274 | xta-000 |
| ISO 639-PanLex | art-274 | xta-001 |
| dižəʼəxon | zav-000 | xta'a |
| Maaya Tʼaan | yua-000 | xtaabay |
| tombo so | dbu-001 | X tààmà dìɛ̀ |
| English | eng-000 | Xtabay |
| español | spa-000 | Xtabay |
| Türkçe | tur-000 | x Tablo |
| tutunakutachawin | top-000 | xtachuná |
| Tacelḥit | shi-001 | xtad |
| xnaꞌátj tu̱ꞌ | trc-000 | xtaj |
| tutunakutachawin | top-000 | xtajatkiwi |
| Malti | mlt-000 | xtajta |
| tutunakutachawin | top-000 | xtaká |
| lagwan | kot-000 | Xt~akien |
| Bangi | bni-000 | xtakisêlã |
| English | eng-000 | X-tal |
| English | eng-000 | XTAL |
| English | eng-000 | xtal |
| tiếng Việt | vie-000 | xtalacmit |
| English | eng-000 | Xtal Backup |
| English | eng-000 | X-tal detector |
| Peace Corps 2007 Tamazight | tzm-009 | xtalf |
| tiếng Việt | vie-000 | Xta-lin |
| diidza xhon | zad-000 | xtalj |
| diidxazá | zap-000 | xtalj |
| dižaʼxon | zpq-000 | xtalj |
| dižaʼxon | zpq-000 | xtaḻj |
| English | eng-000 | xtalk |
| English | eng-000 | X-tal oscillator |
| English | eng-000 | XTAL oscillator |
| English | eng-000 | Xtal oscillator |
| English | eng-000 | Xtalsoft |
| Zapoteco de San Dionisio Ocotepec | ztu-000 | xtaʼmb beʼcw |
| tutunakutachawin | top-000 | xtampín |
| تشلحيت | shi-000 | xtan |
| Tacelḥit | shi-001 | xtan |
| tutunakutachawin | top-000 | xtán |
| tiếng Việt | vie-000 | xtăngxin |
| tiếng Việt | vie-000 | Xtăngxơ |
| tiếng Việt | vie-000 | xtăngxơ |
| tiếng Việt | vie-000 | Xtăng-đan |
| Tacelḥit | shi-001 | xtanna |
| Maaya Tʼaan | yua-000 | xtansia |
| tiếng Việt | vie-000 | Xtanđa |
| dižaʼxon | zpq-000 | xtao' |
| diidza xhon | zad-000 | xtaoʼ |
| diidza xhon | zad-000 | xtao’ |
| diidxazá | zap-000 | xtao’ |
| dižəʼəxon | zav-000 | xta'obi'in |
| dižəʼəxon | zav-000 | xta'obi'iṉ |
| dižaʼxon | zpq-000 | xtao'bi'iṉ |
| dižaʼxon | zpq-000 | xtaobi'iṉ |
| dižaʼxon | zpq-000 | xtao'gwchop |
| dižaʼxon | zpq-000 | xtao'gwyoṉe |
| Q’eqchi’ | kek-000 | xta oq |
| tutunakutachawin | top-000 | xtapasl |
| Malti | mlt-000 | xtaq |
| Malti | mlt-000 | xtaqna |
| Malti | mlt-000 | xtaqt |
| Malti | mlt-000 | xtaqtu |
| dižəʼəxon | zav-000 | xtaquə' |
| Peace Corps 2007 Tamazight | tzm-009 | xtar |
| Malti | mlt-000 | xtara |
| Heiltsuk | hei-000 | Xtarhu |
| Kwak̕wala | kwk-000 | Xtarhu |
| dižəʼəxon | zav-000 | xtarr |
| Peace Corps 2007 Tamazight | tzm-009 | xtarɛ |
| dižəʼəxon | zav-000 | xtas |
| Hunsrik | hrx-000 | xtat |
| tiếng Việt | vie-000 | xtat |
| tiếng Việt | vie-000 | xtate |
| tiếng Việt | vie-000 | xtato |
| Q’eqchi’ | kek-000 | xta uq' |
| tiếng Việt | vie-000 | xtaurotit |
| tutunakutachawin | top-000 | xtawagwa |
| tutunakutachawin | top-000 | xtawi |
| Gününa Küne | pue-000 | -xtawɨ |
| Cineni | cie-000 | xtàxta |
| nəxʷsƛ̕ay̕əmúcən | clm-000 | x̣t̕áyu |
| tiếng Việt | vie-000 | Xtađiom |
| tiếng Việt | vie-000 | xtađiom |
| Yorno-So | dts-001 | X tàŋà bà: |
| ISO 639-3 | art-001 | xtb |
| filename extensions | art-335 | xtb |
| Peace Corps 2007 Tamazight | tzm-009 | xtb |
| ISO 639-PanLex | art-274 | xtb-000 |
| 日本語 | jpn-000 | XTB2D |
| TechTarget file types | art-336 | XTB-External-translation-table-LocoScript |
| boarisch | bar-000 | XTC |
| Deutsch | deu-000 | XTC |
| English | eng-000 | XTC |
| suomi | fin-000 | XTC |
| français | fra-000 | XTC |
| italiano | ita-000 | XTC |
| 日本語 | jpn-000 | XTC |
| Nederlands | nld-000 | XTC |
| polski | pol-000 | XTC |
| русский | rus-000 | XTC |
| español | spa-000 | XTC |
| svenska | swe-000 | XTC |
| ISO 639-3 | art-001 | xtc |
| filename extensions | art-335 | xtc |
| suomi | fin-000 | xtc |
| Nederlands | nld-000 | xtc |
| ISO 639-PanLex | art-274 | xtc-000 |
| ISO 639-PanLex | art-274 | xtc-001 |
| ISO 639-PanLex | art-274 | xtc-002 |
| ISO 639-PanLex | art-274 | xtc-003 |
| Universal Networking Language | art-253 | XTC(icl>drug) |
| TechTarget file types | art-336 | XTC-XTrkCAD-project-file |
| TechTarget file types | art-336 | XTC-XTrkCAD-project-Header |
| TechTarget file types | art-336 | XTC-XTrkCAD-project-with-rem-Header |
| ISO 639-3 | art-001 | xtd |
| ISO 639-PanLex | art-274 | xtd-000 |
| ISO 639-3 | art-001 | xte |
| Deutsch | deu-000 | xte |
| mösiehuali̱ | nhg-000 | xte |
| dižəʼəxon | zav-000 | xte |
| dižaʼxon | zpq-000 | xte |
| Zapoteco de San Dionisio Ocotepec | ztu-000 | xte |
| Zapoteco de San Dionisio Ocotepec | ztu-000 | xteʼ |
| ISO 639-PanLex | art-274 | xte-000 |
| ISO 639-PanLex | art-274 | xte-001 |
| ISO 639-PanLex | art-274 | xte-002 |