Great find! I'll try to reproduce it.

You can already do that: just enter the path of the local file in the address bar.

For example, if you are showing the preview windows for "js/script.js" enter "index.html" to preview the file index.html in the local root directory in Textastic.

You can also enter arbitrary URLs when you switch from local to remote preview.

Textastic offers syntax highlighting for many languages including C, but it doesn't include compilers or interpreters due to restrictions of iOS.

Also, .exe are Windows-only anyway, so it wouldn't be possible to run them on iOS even if Apple allowed this.

Thanks. Another customer reported this problem once, but so far it didn't occur on my own device. If you find a way to reproduce the issue reliably, please let me know!

It depends on the hardware you are using, but more recent iPads like the 3rd or 4th generation iPad should handle such a file without problems.

But, if the file has some very long lines, this could be problem. Especially, if it is a minified .js file.

Will be fixed in Textastic 4.3.