I'm not sure I have a purpose for this, but did you know that you can use the cache file of the Cache Transformation (introduced in SSIS 2008) as a source file in the Raw File Source.
Demo
For this demo I use two Data Flow Tasks. The first creates the cache file and the second one uses it as a source.
 |
| Two Data Flow Task |
1) Create Cache
The first Data Flow has a random source (a flat file in this case) and a Cache Transformation named "CTR - Create Cache" as a destination. When you create the Cache Connection Manager, make sure to check "Use file cache" to provide a file path for the cache file. Copy the path for the next step.
 |
| The Cache Transformation and Connection Manager |
2) Read Cache
The second Data Flow Task uses a Raw File Source. In the editor you can specify the location of the Raw File. Paste the path from the Cache Connection Manager (a .caw file). For demonstration purposes I added a dummy Derived Column behind it with a Data Viewer on the path between them. Now run the package a see the result. You will get some hash columns 'for free'.
 |
| Raw File Source |
Please let me know in the comments if you found a good purpose for this.
Note: you can't use a raw file as a cache file unless you're able to add the extra hash columns as well.