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Keil 4.22 file system bug

Hi,
I encounter a bug with the last release of keil (4.22) which is not in the previous version (4.21). It about the file system library on LPC1769. (so the cortex M3 library)

If I create (with option “w”) a file named xxx.xx and then create (with option “w”) a file named xxx.xx_xx it will erase my previous file (xxx.xx) and create the new one (xxx.xx_xx).
In the same way, if I create (with option “w”) a file named xxx.xx and then create/complete (with option “a”) the content will be write to the file xxx.xx.

Don’t know if it is a bug or something that change with the last release…

Sincerely