File mapping and converting for dynamic disk personalization for multiple platforms are provided. A volatile file operation is detected in a first platform. The file supported by the first platform. A determination is made that the file is sharable with a second platform. The volatile operation is performed on the file in the first platform and the modified file is converted to a second file supported by the second platform. The modified file and second file are stored in a personalized disk for a user. The personalized disk is used to modify base images for VMs of the user when the user accesses the first platform or second platform. The modified file is available within the first platform and the second file is available within the second platform.