# Unknown file extension ".CMD" **URL:** \ **Category:** Flow Protocol\ **Created:** [March 28, 2022, 12:29pm UTC](https://forum.flow.com/t/unknown-file-extension-cmd/2947 "2022-03-28T12:29:11Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![IvanAnikin](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@IvanAnikin](https://forum.flow.com/u/IvanAnikin)\ **Post date:** [March 28, 2022, 12:29pm UTC](https://forum.flow.com/t/unknown-file-extension-cmd/2947/1 "2022-03-28T12:29:11Z")
Hey guys, I’m runnning into this error, when running NFT Storefront in onflow/kitty-items repository clone directory on Windows. 1|web | TypeError [ERR\_UNKNOWN\_FILE\_EXTENSION]: Unknown file extension “.CMD” for C:\USERS\30407792\CODE\KITTY-ITEMS\NODE\_MODULES.BIN\NPM.CMD 1|web | at new NodeError (node:internal/errors:371:5) 1|web | at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get\_format:87:11) 1|web | at defaultGetFormat (node:internal/modules/esm/get\_format:102:38) 1|web | at defaultLoad (node:internal/modules/esm/load:21:14) 1|web | at ESMLoader.load (node:internal/modules/esm/loader:359:26) 1|web | at ESMLoader.moduleProvider (node:internal/modules/esm/loader:280:58) 1|web | at new ModuleJob (node:internal/modules/esm/module\_job:66:26) 1|web | at ESMLoader.#createModuleJob (node:internal/modules/esm/loader:297:17) 1|web | at ESMLoader.getModuleJob (node:internal/modules/esm/loader:261:34) 1|web | at processTicksAndRejections (node:internal/process/task\_queues:96:5) { 1|web | code: ‘ERR\_UNKNOWN\_FILE\_EXTENSION’ Thanks in advance. ---
**Author:** ![andrea](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.flow.com/andrea/32/607_2.png) [@andrea](https://forum.flow.com/u/andrea)\ **Post date:** [March 31, 2022, 8:30am UTC](https://forum.flow.com/t/unknown-file-extension-cmd/2947/2 "2022-03-31T08:30:16Z")
Hi I see you created an issue on Github, let’s continue the conversation there: [https://github.com/onflow/kitty-items/issues/241](https://github.com/onflow/kitty-items/issues/241)