Why does the system convert the temp environment variable to a short file name?

Careful you , You may find such a situation .

When setting environment variables through the control panel of the system ,TEMP and TMP These two environment variables are quietly converted into their short file name versions ( If it can be converted ).

We can't help but ask , Why is that ？

Smart you , I must have guessed ： For compatibility .

For most batch files (.BAT file ) Come on , They assume %TEMP% and %TMP% These two environment variables will not contain internal space characters .( Maybe some other applications will also make such assumptions , However, such problems are particularly prone to occur in general batch scripts .)

I also mentioned a so-called ” If it can be converted ”, Because you can prevent the system from automatically generating short file names , under these circumstances , The path pointed to by the environment variable will not have the corresponding short file name , So as to maintain its original long file name format .

If you are bolder , take TEMP/TMP The environment variable is set to a directory path with spaces and no corresponding short file name , Then you will find , Some parts of the system are not working properly . Please don't blame me for not reminding you .

summary

I opened my Win10, I didn't see the short file name mentioned in the article .
Maybe it's because those old operating systems have gone with the river .

Last

Raymond Chen Of 《The Old New Thing》 It's one of my favorite blogs , There's a lot about Windows Little knowledge , For the vast Windows For platform developers , It's really helpful .
This article is from ：《Why does the system convert TEMP to a short file name?》