MsiFileHash Table
The MsiFileHash table is used to store a 128-bit hash of a source file provided by the Windows Installer package. The hash is split into four 32-bit values and stored in separate columns of the table.
Windows Installer can use file hashing as a means to detect and eliminate unnecessary file copying. A file hash stored in the MsiFileHash table may be compared to a hash of an existing file on the user's computer obtained by calling MsiGetFileHash. The MsiFileHash table can only be used with unversioned files.
The MsiFileHash table has the following columns.
| Column | Type | Key | Nullable |
|---|---|---|---|
| File_ | Identifier | Y | N |
| Options | Integer | N | N |
| HashPart1 | DoubleInteger | N | N |
| HashPart2 | DoubleInteger | N | N |
| HashPart3 | DoubleInteger | N | N |
| Hashpart4 | DoubleInteger | N | N |
Columns
-
File_
-
Foreign key to File table. 72 char string.
-
Options
-
This column must be 0 and is reserved for future use.
-
HashPart1
-
First 32 bits of hash. The file hash entered in this field must be obtained by calling MsiGetFileHash or the FileHash method. Do not use other methods.
-
HashPart2
-
Second 32 bits of hash. The file hash entered in this field must be obtained by calling MsiGetFileHash or the FileHash method. Do not use other hashing methods.
-
HashPart3
-
Third 32 bits of hash. The file hash entered in this field must be obtained by calling MsiGetFileHash or the FileHash method. Do not use other methods.
-
HashPart4
-
Fourth 32 bits of hash. The file hash entered in this field must be obtained by calling MsiGetFileHash or the FileHash method. Do not use other methods.
Validation
Related topics