MSI and MSP Files - They Are Nothing but the Cache

Question

MSI and MSP files. They are nothing but the cache.

Answer 1

Answer 2

I know that Visual Studio Installer can erase MSI files.

The MSI and MSP files situated within the directory labeled “C:\Windows\Installer” function as cache files essential for the appropriate operation of installed programs. These files play a crucial role in ensuring the integrity of software and in documenting installation particulars. Nevertheless, with the passage of time, there is a propensity for these files to accumulate, thereby occupying significant storage capacity. Hence, it becomes imperative to routinely eliminate cache files that are either unused or outdated in order to liberate disk space and enhance system performance.

Answer 3

The caching of MSI (Microsoft Installer) and MSP (Microsoft Patch) files in the C:\Windows\Installer directory serves several purposes:

1. Repair and Maintenance: Storing these files allows Windows Installer to quickly repair or update installed programs without requiring the original installation media. If a program becomes corrupted or needs updating, Windows Installer can use the cached files to perform the necessary operations.
2. Uninstall and Rollback: During uninstallation or rollback operations, Windows Installer may need access to the original installation files to restore the system to its previous state. Having these files cached locally ensures that these operations can be completed smoothly and efficiently.
3. Resilience and Reliability: By keeping a local cache of installation and patch files, Windows Installer ensures that installations and updates can proceed even if the original source is unavailable or inaccessible. This enhances the reliability and resilience of the installation process.
4. Performance: Accessing files from the local cache is generally faster than retrieving them from external sources such as CDs, DVDs, or network shares. This can improve the overall performance of installation, repair, and update operations.

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hth

Marcin